The cats: The name given to the four Battle-Cruisers of the Lion and Tiger Class of the First Battle-Cruiser Squadron of the Grand Fleet. They were: HMS Lion, HMS Tiger, HMS Queen Mary and HMS Princess Royal. Also, colloquial for Caterpillar Tractor Lorries, a four-wheel drive, powerful type used for hauling heavy Howitzers. 
References / notes
- Edward Fraser and John Gibbons (1925). Soldier and Sailor Words and Phrases. Routledge, London p.50.
Glossary of words and phrases
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