Cavalry commander ordered truces (6)

I believe the answer is:

custer

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'cavalry commander' is the definition.
The definition suggests a singular noun which matches the answer.

'ordered truces' is the wordplay.
'ordered' indicates an anagram.
'truces' is an anagram of 'CUSTER'.

Can you help me to learn more?

(Other definitions for custer that I've seen before include "General . . . . . . lost a great battle at Little Big Horn" , "US cavalry leader" , "Massacred US general" , "General who was killed at the battle of Little Bighorn" , "US cavalry commander" .)

I've seen this clue in The Globe and Mail.

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