The church calendar avoids the observance of saints' feasts during certain solemnities, moving the saint's day to a time outside those periods. St Patrick's Day is occasionally affected by this requirement, when 17 March falls during Holy Week. This happened in 1940 when Saint Patrick's Day was observed on 3 April to avoid it coinciding with Palm Sunday, and again in 2008, where it was officially observed on 15 March. St Patrick's Day will not fall within Holy Week again until 2160. However, the popular festivities may still be held on 17 March or on a weekend near to the feast day.
Within weeks of arriving at Bletchley Park, Turing had specified an electromechanical machine called the bombe, which could break Enigma more effectively than the Polish bomba kryptologiczna, from which its name was derived. The first bombe was installed on 18 March 1940.
Reynaud demanded that France be released from the agreement which he had made with Prime Minister Neville Chamberlain in March 1940, so that France could seek an armistice.