After the end of the inconclusive War of 1812, the militia system in Ohio abandoned its regimental formations and reverted to multiple small units representing the various municipalities throughout the rapidly growing state. With the last Indians expelled from the state's borders and peaceful relations along the Canada–US border, there seemed little need for a fully armed and trained militia. With the brief exception of a border dispute with Michigan that caused the Governor to issue a militia call up, meaningful local militia musters and drills again became more the exception than the rule. The Mexican–American War in 1848 saw a renewed interest in vitalizing the militia throughout the entire country. With the regular U.S. Army at a strength of just over 13,000, it became evident that any successful military campaign against Mexico was going to require extensive militia involvement. Ohio played a significant role, raising several regiments of infantry and artillery batteries from existing militia units and volunteers. The 1st Ohio Volunteers comprised part of the army under Gen. Zachary Taylor and took part in the battlefield victories of Monterrey and Buena Vista.