To the north east of the village, between the Old Bedford River and the New Bedford River lies the remains of an English Civil War fort known as Earith Bulwark. It is believed to have been constructed as early as 1643, to fortify the crossing point of the River Great Ouse. Many fenland inhabitants resented the Royalists because they believed that the King's drainage projects undertaken by Dutch engineer Cornelius Vermuyden, had damaged their livelihoods (his Forty Foot Drain had been completed in 1637). Today, the fort is visible as a series of earthworks only, showing a bastion fort design with ditches and corner bastions. It is similar in design to Fort Nassau at Aardenburg in the Netherlands. During the Second World War, a machine gun turret was built on the south bastion.