"Winston Churchill As Prime Minister 1940-1945" The Prime Minister witnessed a tank demonstration in which he was shown the capabilities of various armoured fighting vehicles over rough country near Frensham, Surrey. With him were General Władysław Sikorski, the Prime Minister of the Polish Government-in-Exile and the C-in-C of the Polish Armed Forces, and General Charles de Gaulle, the C-in-C of the Free French Forces. The 2nd Armoured Brigade; 11th Royal Horse Artillery; 76th Anti-Tank Regiment, Royal Artillery; 10th Hussars; 9th Lancers; Queen's Bays, Royal Horse Artillery; 1st Battalion, Rifle Brigade took part in the demonstration.