In the United States Senate Democratic primary election in Pennsylvania on May 18, 2010, Congressman Joe Sestak (pictured) defeated incumbent Arlen Specter, who had been in the Senate for five terms as a Republican. Just before the primary campaign, Specter switched to the Democratic Party in anticipation of a difficult primary challenge by Pat Toomey. Sestak was ultimately defeated by Toomey in the general election. Political observers and journalists described the race between Specter and Sestak as one of the bitterest and most watched of all the 2010 primary elections. Specter led Sestak by more than 20 percentage points for most of the race, but this lead narrowed in the final month of the campaign, when Sestak concentrated his funds and efforts on television commercials questioning Specter's Democratic credentials. Political observers said that Sestak's commercials and a national swing in momentum against incumbents harmed Specter's chances. (Full article...)

Lancaster's chevauchée of 1346 was a large-scale mounted raid directed by Henry, Earl of Lancaster, in south western France during the Hundred Years' War. The main English army had defeated the larger French army at the Battle of Crécy in August, and French defences in the south west were left weak and disorganised. Lancaster took advantage by leading a raid between 12 September and 31 October 1346 while sending other forces into Quercy and the Bazadais. All three offensives were successful, with Lancaster's chevauchée, of approximately 2,000 English and Gascon soldiers, meeting no effective resistance from the French, penetrating 160 miles (260 kilometres) north and storming the rich city of Poitiers. His force then razed and looted large areas of Saintonge, Aunis and Poitou, capturing numerous towns, castles and smaller fortified places as they went. The offensives completely disrupted the French defences and shifted the focus of the fighting. (Full article...)