After General
William Howe successfully drove
George Washington's
Continental Army out of
New York City in the fall of 1776, Washington retreated across
New Jersey, pursued by General
Charles Cornwallis. Washington retreated all the way across the
Delaware River in early December, and the British began arranging winter quarters in New Jersey, establishing a chain of outposts from
Perth Amboy to
Bordentown. The British and their
Hessian allies regularly sent out reconnaissance and foraging parties. These were vulnerable to attack by local
Patriot militia companies. The area around the
Trenton outpost, commanded by
Johann Rall and populated primarily by Hessians, was particularly vulnerable to these militia raids, as was a detachment of the
16th (Queen's) Light Dragoons posted not far away from Trenton at
Pennington. Hunterdon County, north of Trenton, was an area where atrocities were reported in early December, including claims of
rape of girls and pregnant women, perpetrated by groups of British and German soldiers; these reports contributed to an increase in Patriot militia activity in the area north of Trenton.
Cornet Francis Geary was the eldest son and heir of Admiral
Sir Francis Geary and Mary Bartholomew. Born in 1752, he was raised in
Surrey and educated at
Balliol College, Oxford. Purchasing a cornetcy in the 16th Light Dragoons in 1773, Geary was sent to North America in 1776, arriving in New York at the end of September. In October and November, Geary's unit was mainly occupied with forays in northern New Jersey where they met little organized resistance, but on 1 December, his company was ordered to camp at Pennington. On 14 December, Cornet Geary and seven other members of the 16th were sent north on a reconnaissance mission. ==Ambush==