An important event in 1778 led indirectly to his recovering to some extent his former position in the country; this was the alliance of France with the revolted American colonies. Ireland was thereby placed in peril of a French invasion, while the English government could provide no troops to defend the island. A volunteer movement was then set on foot to meet the emergency; in a few weeks more than 40,000 men were under arms, officered by the country gentry, and controlled by Lord Charlemont. This volunteer force, in which Flood was a colonel soon made itself felt in politics.