His foolish statements provided his opponents with more 'ammunition' to use against him in the campaign.
She had the 'ammunition' to prove her case. [=she had the evidence she needed to prove her case]
The troops were supplied with weapons and 'ammunition'.
(..) Some whisky. Tell him to stop asking about the horses. Always good doing business with you. Horses. No horses. All we can trade are guns and ammunition. Tell him if he asks about horses again, there is no deal. Where did you get these? The Americans? They're already branded I'll only be able to get (..)2015 The Revenant