found this 81mm Morser / 3 Inch Mortar Both Axis and Allies use variants of the French Brandt 81mm/3 Inch Mortar design. To use the Mortar, hit your Alt Fire Key (Z). Once the Mortar is readied, a Mortar round can be fired by pressing Fire. The elevation (range) and azimuth (lateral direction) of the Mortar can be adjusted by moving the mouse using the crosshairs as a guide. The lower the angle of elevation, the further the Mortar will fire. You can observe your fall of shot either by line of sight or by looking at your Command Map (G). Field Ops may designate targets for your Mortar as they call in Artillery Strikes. A targeting reticule will appear on your Command Map and in your Mortar sights. You can then aim for the reticle, in the knowledge that your Mortar rounds will be falling on the correct bearing, although you may still have to adjust elevation.