January 8th, 2011 and May 28th, 2011 (Maryland Deathfest)
Fun fact: They were the very first band of the year I saw!
This was at a free Scion sponsored even featuring these guys opening, followed by Black Breath and then Trap Them playing last. If I were to describe Mammoth Grinder, I would describe them as a more punk version of Entombed. These guys are very solid live. Lots of energy and they don't stop for anything. You'll be banging your head the entire time they're playing. I also saw them at Maryland Deathfest later in the year where they did a great cover of Venom's Welcome to Hell