Note: A tank equipped with two SP-Stabbers is required
for this trick. First, use the hills for cover and wait for the
Walker. Then, when it is close, run and jump and hit it while
firing. If you are lucky enough, the Walker will fall. Once
on the ground, the Walker will immediately try to get up again
-- waste no time in killing it. When the Walker is on the ground,
it cannot shoot you. Another technique is to use the thumper
device on Walkers. They will be spinning around so fast that
they become easy tank fodder.