We do know that during the Battle of Lake George (1755), the Mohawk Chief Hendrick was mounted when when the British/Iroquois column was ambushed by the French and their Indian Allies.
From the Siege of Fort William Henry (page 214):
One withness, watching for the entrenched camp, described "While (the surender negotiations were still) on the Carpet," he wrote," the Indians came about the Fort, and with great Tranquility in their countenances; took all the Horses they cound find and Led them off without taking any... notice of us, and without knowing, whether Col. Young and the French General might come to an agreeement about the Terms."
Form Siege of Fort Willian Henry (page 169):
First day of Siege: "Watching from the walls, the defenders could do nothing as the Indians killed 150 head of cattle and rounded up a further 25 to offer to Montcalm to drag his guns in place of those (cattle) they had killed at Carillion. 150 sheep and 50 horses were also taken, although 2 of those that had accompanied Col Young's reinforcements escaped and returned to Fort Edward. As Father Roubaud noted, the captured livestock "were the first fruits of the little war" ".
So count me in !!!