Map 7.3 The Indian War in the West, 1777–1782 Most Indian tribes supported the British. Iroquois Indians attacked New York’s Mohawk Valley throughout 1778, causing the Continental army to destroy Iroquois villages throughout central New York. Shawnee and Delaware in western Pennsylvania tangled with American militiamen in 1779, while tribes near Fort Detroit conducted raids on Kentucky settlers. Sporadic frontier fighting continued through 1782.