There was a civil war in Holland and Hainaut

County of Hainaut

The County of Hainaut was a historical region in the Low Countries with its capital at Mons . In English sources it is often given the archaic spelling Hainault....

 (which was in a personal union with Holland) in 1350 between the Hooks and the Cods

Hook and Cod wars

The Hook and Cod wars comprise a series of wars and battles in the County of Holland between 1350 and 1490. Most of these wars were fought over the title of count of Holland, but some have argued that the underlying reason was because of the power struggle of the bourgeois in the cities against...

. The Hooks were fighting for the Countess Margaret of Hainault

Margaret, Countess of Hainaut

Margaret II of Avesnes was Countess of Hainaut and Countess of Holland from 1345 to 1356. Margaret was the daughter of William I, Count of Hainaut, and his wife, Joan of Valois....

, supported by England

England

England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

, while the Cods were fighting for Margaret's son William

William I, Duke of Bavaria

William I, Duke of Bavaria-Straubing , was the second son of the emperor Louis IV the Bavarian from his second wife Margaret of Holland and Hainaut...

, who was ruling Holland in name of Margaret. William defeated the Hooks and the English in the Battle of Vlaardingen in 1351.