Assertion: tank | /r/HasProperty | parked on straw
Facets:
value: with being engaged in turn
type: OTHER
value: to prevent the steel tracks
type: PURPOSE
Source sentences:
text: Operating in sub-zero temperatures, the 8th Hussars learnt the rigours of winter warfare: their tanks had to be parked on straw to prevent the steel tracks from freezing to the ground, with engines having to be started every half hour, with each gear being engaged in turn, to prevent them from being frozen into place.