 In 1638 he visited Guernsey and Jersey at the request of the governors, Charles Danvers, Earl of Danby and Sir Thomas Jermyn, to survey the castles in those islands and report upon them to the board of ordnance.In February of the following year Rudd petitioned the board of ordnance for the payment of arrears of salary; in June the board recommended the petition to the council, mentioning Rudd's services.In April, having been employed in making a survey of the Portsmouth defences, he recommended that they should be reconstructed at an estimated cost of £4,956.