The extension of the sphere of war owing to the French alliance with America brought great difficulties to the ministry. A powerful fleet under Keppel was sent into the Channel, and in July engaged the French fleet off Ushant, but the action was indecisive, and both fleets retired, the one to Brest, and the other to Plymouth. Keppel had signalled Sir Hugh Palliser, his second in command, to bear up with his squadron, and renew the action, but Palliser's ship was much crippled, and he was either unable or unwilling to comply. Mutual recriminations followed, and as both admirals were in Parliament and political adversaries, Keppel being in Opposition, whilst Palliser was a Lord of the Admiralty, the charges led to a fierce Parliamentary war, and eventually Keppel had to submit to a court martial. The trial took place at Portsmouth, and lasted over a month. The result was anxiously awaited by the City and the country. At length, late in the evening of the 11th February (1779), a courier brought the news that Keppel had been honourably acquitted. The whole of London was at once one blaze of illuminations. Palliser had to make his escape out of Portsmouth for fear of violence, and a house in Pall Mall once occupied by him was completely gutted by the mob and its contents burnt in St. James's Square. The gates of the Admiralty were taken off their hinges. Lord Sandwich had his windows smashed, so had Lord North, and greater damage would have been done but for the interference of the military. [Sidenote: Vote of thanks and Freedom of City to Keppel, 12 Feb., 1779.]