[{SlideShowNav}] !!!Mount Defiance [{Image src='300us.jpg' width='650' height='487' alt='Mount Defiance' class='image_left' popup='false'}] [{SET customtitle='Mount Defiance'}] \\ Mount Defiance in New York state on Lake Champlain overlooks Fort Ticonderoga 1.6 km (1 mi) to the southwest. British forces placed cannon on the 260 m (855 ft) hill forcing the American garrison to abandon the fort on 5 July 1777.