Buy on the cannons, sell on the trumpets.
More French Proverbs:
Wine poured out is not wine swallowed.French
Good bargains are ruinous.
French
With the help of an 'if' you might put Paris into a bottle.
French
A dead man has neither relations nor friends.
French
A galled horse will not endure the comb.
French
A little thing often helps.
French