A war elephant is an elephant that is trained and guided by humans for combat. The war elephant's main use was to charge the enemy, breaking their ranks and instilling terror.
The Imperial Army made use of war elephants as a means to support their heavy infantry units and inspire fear in their opponents. Against foes armed with the same level of weaponry as the Imperial Army, a war elephant is a substantial asset in open-field battle.
Against a modern army such as the JSDF, the war elephant, much like the Armored Ogre is nothing more than a large target to be destroyed by small arms, machine guns and artillery. They are not the equivalent, by any means, to the modern-day tank such as the Type 74 Tank.