His initiation into combat was in the Wyoming Valley, Pennsylvania when Pennsylvanians fought against Connecticut settlers. In 1774, he served in Dunmore's War. In 1775, he was appointed an officer in the British Indian Department. With the outbreak of the American Revolutionary War, Caldwell served with Lord Dunmore's forces in the attack on Norfolk, Virginia, and was injured. Recovered of his wounds, Caldwell went to Fort Niagara, where he was appointed captain in Butler's Rangers on December 24, 1777. In the ranger campaigns, Caldwell was "a very active Partisan", according to the commandant of Fort Niagara. Leading his troops into battle, he exhibited a ruthlessness that the Americans would never forget. On July 3, 1778, he was present at Battle of Wyoming in Pennsylvania. In September 1778 he led an attack on German Flatts in the Mohawk Valley of central New York, together with the Mohawk chief Joseph Brant's leading his Iroquois forces. They destroyed all of the buildings and grain in the area, and killed and captured much livestock, leaving the settlers' struggling through the winter. Based out of Detroit, Caldwell led a force of about 50 rangers in many battles and expeditions in Kentucky and the Ohio Country. In 1782, he led his rangers and Shawnee allies in victories over the Crawford expedition and, after failing at Bryan Station, at the Battle of Blue Licks. After the war, Caldwell settled in the Detroit region that became Upper Canada. Together with other Loyalists, he was granted land in what became Amherstburg on the Detroit River and became a merchant. His partner was another Loyalist, Matthew Elliott. During the Northwest Indian War, he led a company of Canadian militia alongside Western Confederacy Natives against advancing American troops at Fallen Timbers, the final engagement of the war. With the outbreak of the War of 1812, Caldwell was given command of a group of between 40 and 50 volunteers from the Canadian militia, called Caldwell's Rangers. He fought at the Battle of the Thames and the Battle of Longwoods, among many other actions.
Marriage and family
Before his marriage, while in Fort Niagara, Caldwell had a relationship with a Mohawk woman. They named their son, born about 1782, Billy Caldwell. The boy was first raised with his mother's people. In 1783 Caldwell married Suzanne Baby, daughter of Jacques Baby dit Dupéron. Together they had eight children, five sons and three daughters. In 1789 his father brought the boy Billy Caldwell into his family and gave him an education. Billy Caldwell later lived in the United States after 1818, where he became a prominent representative of the Potowatomi people in Illinois and Iowa. He was sometimes known to them as Sauganash, their term for a British Canadian.
Career
In the War of 1812, Caldwell was commissioned a lieutenant colonel. He gained commissions for all his sons by Suzanne in the regular army; Billy Caldwell was given a captain's commission in the Indian Department. After the death of Matthew Elliot in April 1814, Caldwell was appointed Superintendent of Indians in the Western District, with his son Billy as his second-in-command. William Caldwell died on February 20, 1822 in Amherstburg, Upper Canada.
