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As the ranks drew near to the German lines...rifles and machine guns pounded forth a rapid-fire of death from behind walls and hummocks and the windows of houses.

The tiny footsteps glowed under her flashlight, leading around mossy hummocks and beneath fallen branches and up tree trunks and then back down again.

Frequently, one of the dog teams had to be unharnessed from its sled and then hitched to a lifeboat to help the men drag it up and over a hummock or ridge.

Spinifex grasses start out as small round hummocks, said Angela Moles, an ecologist at the University of New South Wales and an author of the new paper.

Swales and hummocks created through excavation connect the wetland cells and diversify the habitat and landscape features.