The army marched north from Urbana, Ohio on 10 June, joined by the 4th U.S. Infantry under Lieutenant Colonel James Miller. Hull ignored an earlier route established by Anthony Wayne and created a new route to Detroit across the Great Black Swamp area of northwest Ohio. He received a letter from Eustis on 26 June that was dated 18 June, warning him that war was imminent and urging that he should make for Detroit "with all possible expedition", so he hastened his march. His draft horses were worn out by the arduous march, so he put his entrenching tools, medical supplies, officers' baggage, despatches, some sick men and the army's band aboard the packet vessel "Cayahoga" at the foot of the Maumee River, to be transported across Lake Erie.