As well as fighting the Cambodian Civil War against the pro-Sihanouk and communist insurgents and the North Vietnamese, the Khmer Republic faced considerable internal problems. Sihanouk's domination of political life during the 1950s and 60s meant that there were few confident or experienced Cambodian politicians. Almost from the start, the Republic was plagued by many of the same political divisions and infighting that had marked Sihanouk's regime; primary among these was a damaging power struggle between Lon Nol and Sirik Matak. Sirik Matak had been acting Prime Minister during the Republic's first year, when Lon Nol's health had been extremely poor, but had engendered considerable resentment due to his administrative style and royal connections; there was also growing frustration amongst young, urban Cambodians at the continued corruption and inefficiency of the regime. On Lon Nol's return from hospital in Hawaii in April 1971, he instigated a cabinet crisis by resigning, providing a means to dissolve the government, with the probable encouragement of his brother Lon Non (a figure of considerable influence, especially with the military). After much political squabbling, a new cabinet was formed, though Sirik Matak continued as acting premier with the title of "Prime Minister-Delegate". On 16 October 1971, Lon Nol took action to strip the National Assembly of legislative power, and ordered it to write a new constitution, claiming that these actions were necessary to prevent anarchy; this provoked a protest by In Tam and 400 Buddhist monks.