|Battle of Toronto Island (Western Collapse)|
|Part of the Toronto War|
|Canada||Union of Canadian Islamists|
|Derek Johnstone||Muhammad Al Nisar|
|75 ground forces, 1 destroyer||110 ground forces|
|Casualties and losses|
The Battle of Ontario was a battle in the Toronto War which took place on June 18, 2027 when the Union of Canadian Islamists (UCI) launched an invasion of Toronto Island. It was the only time in the war that saw involvement of the Royal Canadian Navy as the HMCS Iroquois, a Canadian destroyer launched two attacks on the advancing UCI forces. The battle resulted in a Canadian victory.