 Later he worked on the building of fortifications against the English for Mary of Guise, 1554–56, and collecting taxes to fund these defensive works.In Spring 1558 he worked on repairs to the forewall of Edinburgh Castle and the parapet of David's Tower, and Holyroodhouse.From August to October 1558 he was busy directing works on the Island of Inchkeith, including the construction of a munition house, to complete an artillery fortress designed by the Italian military engineer and architect Lorenzo Pomarelli.