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25 across: Old missile made of wood used by English chief retreating (7)
Firepit or firepot possibly?

28 down: Mythological hero, Greek character involved in omen with daughter (7)
Looks like Sigmund?

28d SIGMUND
Greek character=MU, in omen, SIGN + D (aughter)

Firepot was a missile.
Wood is "fir"
English is "E".
Chief is "top" retreating "pot".

Thanks very much to you.