The terms Revolutionary War and American Revolution are often used interchangeably, though the Revolution included political and social developments before and after the war itself. This article refers solely to the military campaign; for the broader perspective, including the origins and aftermath of the war, see the American Revolution.
Colonists
Colonists living in British North America were divided over which side to support in the war. About 40 to 45% of the population supported the struggle for independence, and were known as "Patriots" (or "Whigs"). About 15 to 20% supported the British Crown during the war, and were known as "Loyalists" (or "Tories"). Loyalists fielded perhaps 50,000 men during the war years in support of the British Empire.1 For that reason, many historians have noted that the war was as much a civil war as a it was a colonial one.
When the war began, the American revolutionaries did not have a professional army (also known as a "regular" or "standing" army). Each colony instead provided for its own defenses through the use of local militia. Militiamen served for only a few weeks or months at a time, were generally reluctant to go very far from home, and would often come and go as they saw fit. Militia typically lacked the training and discipline of regular troops, but could be effective when led by talented officers.
Seeking to coordinate Patriot military efforts, the Continental Congress established (on paper) a regular army—the Continental Army—in June of 1775, and appointed George Washington as commander-in-chief. The development of the Continental Army was always a work in progress, and Washington reluctantly augmented the regular troops with militia throughout the war. Although as many as 250,000 Patriots may have served as regulars or militiamen in the eight years of the war, there were never more than 90,000 total men under arms for the Patriots in any given year. Armies in North America were small by European standards of the era; the greatest number of men that Washington personally commanded in the field at any one time was fewer than 17,000.2
European nations
Early in 1775, the British army consisted of about 36,000 men worldwide, but wartime recruitment steadily increased this number. Additionally, over the course of the war the British hired about 30,000 German mercenaries, popularly known in the colonies as "Hessians" because many of them came from Hesse. Germans would make up about 1/3 of the British troop strength in North America. By 1779, the number of British and German troops stationed in North America was over 60,000, though these were spread from Canada to Florida.3
France, the Netherlands and Spain entered the war against Great Britain in an attempt to dilute Britain's emerging superpower status. France officially entered the war in 1778 and soon sent troops, ships and military equipment to fight alongside the American Patriot army against the British for the remainder of the war. French military involvement in the war proved decisive, though disastrous for the French economy. France's standing army at the time is estimated to have been some 100,000. Spain entered the war in 1779, but did not recognize the new American nation and sent no troops, but medicines, provisions and weapons to aid the United States. On the other hand, the Spanish colonial forces from Louisiana were mobilized and took active part in combat under command of General Bernardo de Gálvez. The Netherlands entered the war late in 1780, but its navy and army was soon overwhelmed by the superior British Royal navy and army.
War in the North
Massachusetts, 1774 to 1776
On the night of 18 April 1775, General Gage sent 900 men to seize munitions stored by the colonial militia at Concord, Massachusetts. Several Patriot riders—including Paul Revere—alerted the countryside, and when the British troops entered Lexington on the morning of 19 April, they found 75 minutemen formed up on the village common. Shots were exchanged, and the British moved on to Concord, where there was more fighting. By the time the "redcoats" (as the British soldiers were called) began the return march, several thousand militiamen had gathered along the road. A running fight ensued, and the British detachment suffered heavily. With the Battle of Lexington and Concord—the "Shot heard 'round the world"—the shooting had started.
After the battles of Lexington and Concord, thousands of Patriot militiamen converged on Boston, bottling up the British in the city. Late in May, Gage received by sea about 4,500 reinforcements and a trio of generals who would play a vital role in the war: William Howe, John Burgoyne, and Henry Clinton. They formulated a plan to break out of the city.
On June 17, 1775, British forces under General Howe seized the Charlestown peninsula at the Battle of Bunker Hill. The battle was technically a British victory, but losses were so heavy that the attack was not followed up. Thus the siege was not broken, and General Gage was soon replaced by Howe as commander-in-chief for the British.
In July of 1775, George Washington arrived outside Boston to take charge of the colonial forces. The standoff continued throughout the fall and winter. In early March of 1776, heavy cannons that had been captured by Patriots at Fort Ticonderoga were moved to Boston, a difficult feat engineered by Henry Knox. When the guns were placed upon Dorchester Heights, overlooking the British positions, Howe's situation became untenable. The British evacuated the city on March 17, 1776 and sailed for temporary refuge in Halifax. The colonial militia dispersed, and in April Washington took most of the Continental Army to fortify New York City.
Canada, 1775 to 1776
During the long standoff at Boston, the Continental Congress sought a way to seize the initiative elsewhere. Congress had initially hoped that Canada would join them as the fourteenth colony, but when that failed to happen, an invasion of Canada was authorized. Two expeditions were undertaken. On September 16, 1775, Brigadier General Richard Montgomery marched north from Fort Ticonderoga with about 1,700 militiamen, capturing Montreal on November 13. General Guy Carleton, the governor of Canada, escaped to Quebec.
The second expedition, led by Colonel Benedict Arnold, set out from Fort Western (present day Maine) on September 25. The expedition was a logistical nightmare, and many men succumbed to smallpox. By the time Arnold reached Quebec in early November, he had but 600 of his original 1,100 men. Nevertheless, Arnold demanded the surrender of the city, to no avail. Montgomery joined Arnold, and they attacked Quebec on December 31, but were soundly defeated by Carleton. Montgomery was killed, Arnold was wounded, and many men were taken prisoner. The Patriots held on outside Quebec until the spring of 1776, and then withdrew.
Another attempt was made by the Patriots to push back towards Quebec, but failed at Trois-Rivières on June 8, 1776. Carleton then launched his own invasion, and defeated Arnold in a naval battle on Lake Champlain (the Battle of Valcour Island) in October. Arnold fell back to Fort Ticonderoga, where the invasion of Canada had begun. The invasion of Canada ended as an embarrassing disaster for the Patriots, but Arnold's improvised navy on Lake Champlain managed to delay the fateful British counter thrust (the Saratoga Campaign) until 1777
New York and New Jersey, 1776 to 1777
Having withdrawn from Boston, the British now focused on capturing New York City. General Howe, with the services of his brother, Admiral Lord Richard Howe, began amassing troops on Staten Island in July of 1776. General Washington, with a smaller army of about 20,000 men, unwittingly violated a cardinal rule of warfare, and divided his troops about equally between Long Island and Manhattan, thus allowing the Howes to engage only one half of the Continental Army at a time.
In late August, the Howes transported about 22,000 men (including 9,000 "Hessians") to Long Island. In the Battle of Long Island on August 27, 1776, the British expertly executed a surprise flanking maneuver, driving the Patriots back to the Brooklyn Heights fortifications. General Howe then laid siege to the works, but Washington skillfully managed a nighttime evacuation to Manhattan.
Having taken Long Island, the Howes moved to seize Manhattan. On September 15, General William Howe landed about 12,000 men on lower Manhattan, quickly taking control of New York City. The Patriots withdrew to Harlem Heights, where they skirmished the next day, but held their ground.
When Howe moved to encircle Washington's army in October, the Patriots again fell back, and a battle at White Plains was fought on October 28, 1776. Once more the Patriots retreated, but Howe, instead of aggressively pursuing the withdrawal, returned to Manhattan and captured Fort Washington in mid November, taking almost 3,000 prisoners. Four days later, Fort Lee, across the Hudson River from Fort Washington, was also taken.
The outlook of the Continental Army — and thus the revolution itself — was bleak. "These are the times that try men's souls," wrote Thomas Paine, who was with the army on the retreat. The army had dwindled to fewer than 5,000 men fit for duty, and would be reduced to 1,400 after enlistments expired at the end of the year. Spirits were low, popular support was wavering, and Congress had abandoned Philadelphia in despair.
Washington reacted by taking the offensive, stealthily crossing the Delaware on Christmas night and capturing nearly 1,000 Hessians at the Battle of Trenton on December 26, 1776. Cornwallis marched to retake Trenton, but was outmaneuvered by Washington, who successfully attacked the British rearguard at Princeton on January 3, 1777. Washington then entered winter quarters at Morristown, New Jersey, having retaken much of New Jersey, and having secured two bold, morale-boosting victories in quick succession to reinvigorate the flagging revolution.
Philadelphia Campaign, 1777 to 1778
Having secured New York City in his 1776 campaign, in 1777 General Howe concentrated on capturing the capital of Philadelphia. He moved slowly, landing 15,000 troops in late August at the northern end of Chesapeake Bay, about 55 miles (90 km) southwest of Philadelphia. Washington positioned his 11,000 men between Howe and Philadelphia, but was outflanked and driven back at the Battle of Brandywine on September 11, 1777. The Continental Congress once again abandoned the city. British and Patriot forces maneuvered around each other for the next several days, clashing in minor encounters such as the so-called "Paoli Massacre." On September 26, Howe finally outmaneuvered Washington, and marched into Philadelphia unopposed.
After taking the city, the British garrisoned about 9,000 troops in Germantown, five miles (8 km) above Philadelphia. Washington unsuccessfully attacked Germantown in early October, and then retreated to watch and wait. Meanwhile, the British secured the Delaware River by taking (with difficulty) forts Mifflin and Mercer in November.
General Washington's problems at this time were not just with the British. In the so-called Conway Cabal, some politicians and officers unhappy with Washington's recent performance as commander-in-chief secretively discussed his removal. Washington, offended by the behind-the-scenes maneuvering, laid the whole matter openly before Congress. His supporters rallied behind him, and the episode abated.
Washington and his army encamped at Valley Forge in December of 1777, about 20 miles (32 km) from Philadelphia, where they would stay for the next six months. Over the winter, 2,500 men (out of 10,000) died from disease and exposure. However, the army eventually emerged from Valley Forge in good order, thanks in part to a training program supervised by Baron von Steuben.
Meanwhile, there was a shakeup in the British command, with General Clinton replacing Howe as commander-in-chief. French entry into the war had changed British war strategy, and Clinton was ordered by the government to go on the defensive in the North. He abandoned Philadelphia and marched back towards New York City.
Washington's army shadowed Clinton on his withdrawal, and forced a battle at Monmouth on June 28, 1778, the last major battle in the North. Washington's second-in-command, General Charles Lee, ordered a controversial retreat during the battle, angering Washington and allowing Clinton's army to escape. By July, Clinton was in New York City, and Washington was again at White Plains. Both armies were back where they had been two years earlier. With the exception of scattered minor actions in the North, like the Battle of Stony Point, the focus of the war now shifted elsewhere
Carolinas, 1780 to 1781
Clinton finally moved against Charleston in 1780, blockading the harbor in March, and building up about 10,000 troops in the area. Inside the city, General Benjamin Lincoln commanded about 2,650 Continentals and 2,500 militiamen. When British Colonel Banastre Tarleton cut off the city's supply lines in victories at Monck’s Corner in April and Lenud’s Ferry in early May, Charleston was surrounded.
The besiegers dug trenches closer and closer to the city until, on May 12, 1780, General Lincoln surrendered his 5,000 men — the largest surrender of U.S. troops until the American Civil War. With relatively few casualties, Clinton had seized the South’s biggest city and seaport, winning perhaps the greatest British victory of the war, and paving the way for what seemed like certain conquest of the South.
The remnants of the southern Continental Army began to withdraw to North Carolina, but were pursued by Colonel Tarleton, who defeated them at the Battle of Waxhaws on May 29, 1780. A story (probably exaggerated) quickly spread that Tarleton had massacred many Patriots after they had surrendered. “Bloody Tarleton” became a hated name among the rebels, and “Tarleton’s quarter”—referring to his reputed lack of mercy (or “quarter”)—soon became a Patriot rallying cry.
With these events, organized Patriot resistance in the South had collapsed, though the war was carried on by partisans such as Francis Marion. General Clinton turned over British operations in the South to Lord Cornwallis. The Continental Congress dispatched the "hero of Saratoga," General Horatio Gates, to the rescue with a new army. But Gates promptly suffered one of the worst defeats in U.S. military history at the Battle of Camden on August 16, 1780, setting the stage for Cornwallis to invade North Carolina.
The tables were quickly turned on Cornwallis, however. One wing of his army was utterly defeated at the Battle of Kings Mountain on October 7, 1780, delaying his move into North Carolina. Kings Mountain was noteworthy because it was not a battle between British redcoats and Patriot troops: It was a battle between American Loyalists and American Patriots. The Revolutionary War was in many ways a civil war; this was especially true in the South.
Gates was replaced by George Washington's most dependable subordinate, General Nathanael Greene. Greene assigned about 1,000 men to General Daniel Morgan, a superb tactician who crushed Tarleton’s troops at the Battle of Cowpens on January 17, 1781. Greene proceeded to wear down his opponents in a series of battles (Guilford Court House, Hobkirk's Hill, Ninety Six, and Eutaw Springs), each of them tactically a victory for the British, but giving no strategic advantage to the victors. Greene summed up his approach in a motto that would become famous: "We fight, get beat, rise, and fight again." Unable to capture or destroy Greene's army, Cornwallis turned his attention to Virginia.