Marching north in revolution

On May 3, 1775, he was appointed a major in Varnum's Regiment by the Rhode Island legislature. He was given command of a company and marched to Cambridge, Massachusetts and became part of the Army of Observation in support of the rebellion against British rule.

In September 1775, George Washington put Major Greene in charge of a battalion in Cambridge under the command of Colonel Benedict Arnold. Greene's battalion was part of Arnold's expedition through present-day Maine to attack the British garrison at Quebec. In the assault on that city on December 31, 1775, Greene led a detachment of troops, and, after Arnold was wounded, Greene was taken prisoner by the British. He was exchanged after eight months' confinement in August 1776.

In New Jersey

In June 1776, Greene was promoted to major in the 9th Continental Regiment under Colonel James M. Varnum, in a division which was commanded by his third cousin, General Nathanael Greene. (In January 1777 the 9th Continental Regiment was renamed as the 1st Rhode Island Regiment.) On 27 February 1777 Greene was promoted to colonel, and placed in command of the regiment, following Varnum's promotion to brigadier general.

In October, Greene was in charge of Fort Mercer, New Jersey, on the Delaware River near Woodbury in a section of Deptford Township, now National Park, New Jersey, south of Philadelphia and Trenton in Gloucester County.

Fort Mercer and its Pennsylvania counterpart on the west side of the river, Fort Mifflin, had the mission of defending the Delaware River against British naval movements on the river. After the British captured Philadelphia in September 1777, the forts prevented the Royal Navy from bringing supplies into the city.

On October 22, 1777, the fort was assaulted by the Hessians under Colonel Carl von Donop, in what came to be called the Battle of Red Bank in Red Bank in Gloucester County. Von Donop was eager to avenge the 1776 defeat of Hessian troops by Washington in the Battle of Trenton. Though they were supported by gunfire from six British men-o-war in the Delaware River, they were repulsed with heavy loss, and von Donop was mortally wounded.

Greene spent the winter of 1777 to 1778 with his regiment at the Continental Army's winter quarters at Valley Forge near Philadelphia, Pennsylvania.

Battle of Rhode Island

Early in 1778, Colonel Greene returned to the cooler climate of his home state. He struggled to piece together a unit of former slaves, the 1st Rhode Island. When the idea of offering slaves their freedom in return for active service was first suggested, all concerned believed the plan would help solve the problem of finding Continental recruits. The Rhode Island General Assembly voted that every able-bodied Negro, mulatto, and Indian slave could enlist for the duration of the war with bounties and wages the same as for free men. Once enlisted and approved by the regimental officers the slave would become free.^[2]

The small population of 3,331 blacks and Indians, however, could not support the effort adequately. Fewer than two hundred soldiers were recruited. Finding the scheme expensive and impractical, the legislators reversed themselves. "No negroe, mulatto, nor Indian slave will be permitted to enlist in the Continental battalions after 10 June 1778." Greene and his officers proceeded to train the black infantrymen who had already signed on. All heard the news that a French fleet was on the way, and many were looking forward to some serious fighting in the near future.

The decision to stop recruitment also reflected how controversial black regiments were and recognition that, as fighting moved to the Southern colonies, the white Southern slave owners would not tolerate the presence of black regiments.^[3]

Colonel Greene and his regiment were detached for special service in Rhode Island, and he was placed under the command of General John Sullivan. General Sullivan, whose headquarters were in Providence, was charged with the task of containing the depredations of the 4,000 British and Hessian troops occupying Newport on Aquidneck Island. For this purpose he had only a brigade of Rhode Island state troops, and several thousand as yet unmobilized militia. In early July 1778 orders from General Washington changed Sullivan's mission from defense to attack and thrust the quiet Rhode Island sector into the forefront of the war.

The Battle of Rhode Island commenced on August 29, 1778. Colonel Greene temporarily commanded a brigade in the center of the American order of battle. Greene's "Black Regiment", now under General Nathanael Greene's longtime friend, Maj. Samuel Ward Jr, held the far right of the American line. This regiment served with distinction, praised by the allied French officers for repulsing attacks by Hessian soldiers. Due to losses on the eastern flank, General Sullivan was forced to withdraw all American forces from the field, leaving the British forces still in control of Aquidneck Island. ^[4]