Two alien societies previously at war that have ceased to be: I'll call them Mardu and Temur because I can, even though they have nothing to do with those clans from Khans of Tarkir.
Mardu had a militaristic and nomadic warband civilisation that was fuelled by a war economy, and by constant movement through the wilderness, and raids on the Temur cities.
Temur had a small number of cities, and was very well defended, and generally did not care to take the war to the Mardu: they were content to be attacked, in part because they feared the Mardu and retaliation or advance attacks only made t…