In 1217 he took a prominent share in helping Hubert de Burgh to win his victory over the French fleet commanded by Eustace the Monk in the Straits of Dover.
The rule of the young Richard of Cornwall had distracted the country; and Trubleville's correspondence with Henry III shows him contending with want of money, a revolt in Bayonne, a conspiracy in Bordeaux, disputes with the viscount of Béarn, and unsettled relations with the French king.
Turberville took a force of soldiers on shipboard from Bristol and sailed up the River Towy to the beleaguered castle and town.
Turberville was reappointed seneschal of Gascony on 23 May 1234, and was ordered to be at Portsmouth by Ascensiontide to command a force destined to help Peter, Count of Brittany.
We send you this instruction, asking that, as you love and honor us, you be at Portsmouth with four other knights promptly at the feast of the Ascension in the eighteenth year of our reign (June 1, 1234).
After Easter 1238 Turberville was sent by Henry III at the head of an English force destined to help his brother-in-law, the Emperor Frederick II, against the rebellious Lombards.
Turberville returned to England, and on 12 November 1239 was one of the numerous band of nobles who, headed by Richard of Cornwall, bound themselves by oath to go on crusade.