How to use "tripod" in a sentence

How can I describe this Thing that I saw? It was an enormous tripod, higher than many houses, stepping over the young trees

Then suddenly, the trees in the wood ahead of me were pushed to the side and a second enormous tripod appeared, rushing, as it seemed, straight towards me

He watched as the foot-soldiers rushed towards the tripod

Then the tripod walked slowly over the common

Then the tripod turned and walked away towards where the second cylinder lay.