There are two main ways to defend yourself in Sloths Mining War. First is to keep your SlothShard under 12; this means no one can attack you. The 'noobie safety net'.

The second method is to stack up on Sloth miners and have more SlothShards than everyone else! Combine those with the perks and you can become an unstoppable force!

There is also the 'TorPor' for when you're feeling a little slothish and need 8 hours of peace (or in my case, sleep!)