What two battles were fought in the winter of 1777-78 in order to boost the morale of washington's soldiers?

Battle of Saratoga (1777) - Americans won - A series of battles between British soldiers and the Continental Army (Patriots) in upstate New York that led to the surrender of British General Burgoyne and his troops at Saratoga (NY). After this, the French and the Spanish both recognized the colonies as independent from Britain.  And Valley Forge (winter 1777-78) Washington's army spent a harsh winter here in 1777-1778; 25% of troops who served during this time died from disease and malnutrition; they lacked food, proper clothing, and shelter. The German officer Von Steuben came here to train the American troops.

frederick william of brandenburg-prussia trained his son, frederick, to be a hardy soldier. but frederick disliked rifle shooting and horseback riding. unlike his father, he was interested in french literature. he enjoyed poetry and music and, like some others of the enlightenment, he scoffed at religion. his father thought him soft, frivolous and unmindful of his duties. and when frederick refused to put his signature on a right to succession, for a few moments his father strangled him.

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