Final answer:
The major developments that played a key role in the outcome of the Battle of Trenton were Washington's surprise attack, the favorable weather conditions, and the weaknesses of the Hessian forces.
Step-by-step explanation:
The major developments that played a key role in the outcome of the Battle of Trenton were:
- Washington's surprise attack: General George Washington crossed the Delaware River and led his troops in a surprise attack on the Hessian forces in Trenton. The element of surprise caught the Hessians off guard and contributed to the American victory.
- Weather conditions: The bad weather, including icy river conditions, played to Washington's advantage. The Hessians mistakenly assumed they were safe from attack due to the weather, allowing Washington to catch them off guard.
- Hessian weaknesses: During the battle, the Hessians faced several challenges. Many of their guns malfunctioned, weakening their firepower. Additionally, their commanders suffered casualties, including Colonel Rall who was mortally wounded. These weaknesses further contributed to the American victory.