Don't tump that bucket over!

The Army decommissioned the Sherman tank by filling the turret with cement.

Put some more spacing between those two words to make them more readable.

Exploring, I found another short gallery running transversely to the first. This appeared to be devoted to minerals, and the sight of a block of sulphur set my mind running on gunpowder. But I could find no saltpeter; indeed no nitrates of any kind. Doubtless they had deliquesced ages ago. Yet the sulphur hung in my mind and set up a train of thinking.