Anti-Tripod Gun Battery

AT, yep that can only mean Anti-Tripod

While the majority of artillery used in the great Martian War are general purpose weapons originally designed for human foes, the Anti-Tripod gun is the first purpose built weapon to counter the Invaders. Originally developed by the German company Krupp for the Kaiser and the German Empire in the days after the first Invasion, the United States imported a number of examples to investigate their viability. When the Second Invasion began the State Department was still attempting to acquire the manufacturing rights to begin domestic production, but simple things like copyrights don't seem all that important when faced with a tidal wave of tripods and the AT Gun was soon in domestic production with assurances passed to the Germans that things like royalties would certainly be payed out some time in the future.

The Anti-Tripod Gun has proved highly effective in the field despite its limited numbers. The 3.5 inch (or 90 mm if you're a European weirdo) high velocity shell is more than capable of smashing through the Alien war machines, and is especially potent when equipped with special Martian alloy capped shells.

The trademark over sized gun shield provides a bit more protection to the gun crew. The gun shield is manufactured in the same way as the hulls of the steam tanks with layers of asbestos insulation sandwiched in between steel plates.