2,000,000 years
The War of 1812.
Britain declared war on Germany after Hitlers Army entered Poland on the 3rd September 1939. Hostility's ended May 8th 1945.
War of 1812
The Falklands War of 1982
It lasted from September 1939 till May 1945 in all of Britain.
No the Americans won because the British didn't think the war would last as long as it did so they surrendered and recognized America as an independent country.
The battle to end the Revolutionary War was the Battle of Yorktown
When Britain got involved because at the time it was a colony of Great Britain.
Churchill
The war of the roses took place in medieval britain, and the last battle was a Bosworth Field.
The last battle of the Revolutionary War.
Please give the timeframe. Are you thinking of the Boer War?