It would be kind of hard to fire a laser over obstacles like a mortar. Unless, perhaps, you send up a attach a mirror to a balloon and fly it over the battlefie

It would be kind of hard to fire a laser over obstacles like a mortar. Unless, perhaps, you send up a attach a mirror to a balloon and fly it over the battlefield so you can bounce your laser. :) The same goes for Katyushas (rockets). Most of them have a range that's well over the horizon, so it would be difficult to fill the same use case with a laser.