Back in England, he married Elizabeth Capell, five years his senior, and widow of Justinian Lewin, a Privy Councillor; while childless, their marriage was apparently happy. Invited to stand as MP for Somerset in 1624, he declined, instead joining an English force recruited by Mansfeld to relieve Breda, then besieged by the Spanish. They arrived in the Dutch Republic in February 1625, reportedly in an 'appalling state;' the expedition collapsed, Breda surrendered, and Hopton returned home in July.