Overtask

We were almost always under fire from the enemy; but with the utmost cheerfulness, and even, I may say, good-humour, the whole of the infantry did all in their power to lighten the work of the overtasked artillerymen: comrades we were, all striving for the accomplishment of one purpose--that of bringing swift and sure destruction on the rebels who had for so long a period successfully resisted our arms.

Source: wiktionary

Each man, after death, was called upon to make the "Negative Confession," to prove that he had not sinned against his fellows, that he had not oppressed or taken bribes, had not judged wrongfully, had not injured a slave or overtasked the poor man, had not murdered or stolen, lied or committed adultery, had not given short weight or robbed the gods and the dead, had made none to "hunger" or "weep."

Source: wiktionary

Think of it! the strength of one hundred horses overtasked day by day to provide this magic powder, through which the tired real horse is to drag the plough in so many thousands of distant acres!

Source: wiktionary

But when, on the contrary, he is overtasked, and more ideas are forced upon his attention than his capacity can receive, the mind becomes disturbed and confused, the mental perception becomes cloudy and indistinct, and all that is communicated in these circumstances is absolutely lost.

Source: wiktionary