With a team of archaeologists, Neil and Tony are off to investigate the Battle of Shrewsbury which took place in 1403, at the end of a sweltering hot day in July. The Church of St Mary Magdalene, built in commemoration of the battle, stands on the spot where it is thought 2000 soldiers were buried in a mass grave. The battle had its origins in 1399 when Henry Bolingbroke overthrew the rightful king of England, Richard II, and had himself crowned Henry IV.