1805 battle, often considered Napoleon's greatest victory (10)

I believe the answer is:

austerlitz

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'victory' is the definition.
(I have seen 'French victory ' mean 'austerlitz' so perhaps 'victory' could also mean 'austerlitz')

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for austerlitz that I've seen before include "battle" , "One of 29 dn's battles" , "French victory" , "One of Napoleon's victories" , "Napoleon victory, 1805" .)

I've seen this clue in The Times.

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