England's islands were difficult to govern, and were prone to neglect, yet their strategic value far outweighed their size. Though vulnerable to foreign threats, their harbours and castles served as forward bases of English power. In civil war they were divided and contested, fought over and occupied. Jersey and the Isles of Scilly served as refuges for royalists on the run. Charles I was held on the Isle of Wight. External authority was sometimes light of touch, as English governments used the islands as fortresses, commercial assets, and political prisons. London was often puzzled by the linguistic differences, tangled histories, and special claims of island communities. Though increasingly integrated within the realm, the islands maintained challenging peculiarities and distinctive characteristics.
Drawing on a wide range of sources, and the insights of maritime, military, and legal scholarship, this is an original contribution to social, cultural, and constitutional history.