Impressment was strongly criticized by those who believed it to be contrary to the British constitution; at the time, unlike many of its continental rivals, Britain did not conscript its subjects for any other military service, aside from a brief experiment with army impressment in 1778 to 1780. Though the public opposed conscription in general, impressment was repeatedly upheld by the courts, as it was deemed vital to the strength of the navy and, by extension, to the survival of the realm.