After negotiating with Don Pedro de Cevallos, the Spanish minister of foreign affairs, from January to May 1805, without success, Monroe returned to London and resumed his negotiations, which had been interrupted by his journey to Spain, concerning the impressment of American seamen and the seizure of American vessels.
The provisions of the law, however, have never been enforced, and the actives or regular army are recruited by impressment rather than through conscription.
A pamphlet written to propose a substitute for the system of impressment in 1822 is said to have offended King William IV.
On another occasion he is said to have taken a man out of a British ship in retaliation for the impressment of an American seaman by H.M.S.
These pamphlets contain an extreme statement of the anti-war party and defend impressment as a right of long standing.
He constantly protested against flogging in the army, the impressment of sailors and imprisonment for debt.