The only mutiny in the history of the Royal New Zealand Navy begins.
During April 1947, the Royal New Zealand Navy (RNZN) experienced a series of non-violent mutinies amongst the enlisted sailors of four ships and two shore bases. Over 20% of the RNZN's enlisted personnel were punished or discharged for their involvement. The main cause was the poor rates of pay compared to the rest of the New Zealand Defence Force and equivalent civilian wages, exacerbated by the release of a long overdue government review which failed to address the issue. Sailors saw the new pay rates as still inferior to the other branches of the military, with the increases being consumed by taxes, inflation, and the cancellation of allowances and benefits. The poor living and working conditions aboard RNZN ships was another issue, compounded by sailors having no effective way to make dissatisfaction known to the higher ranks. Dissatisfaction with peacetime duties and opportunities also contributed, with many sailors locked into enlistment periods of up to 12 years, and demobilisation efforts prioritising those enlisted specifically for the duration of World War II.
On April 1, around 100 sailors from the shore base HMNZS Philomel, in Devonport, declared their intent to refuse duty. They were joined by another 100 personnel from the cruiser HMNZS Black Prince and the corvette HMNZS Arbutus, who marched off the base. After campaigning for three days and winning the right to backdated pay, the mutineers were given a choice: return to duty and accept punishment, or be discharged. The majority chose the latter. These men were financially penalised, denied access to veterans' benefits, and suffered government bans on employing them. The 23 who returned to duty were punished through rank reductions, reductions in rank and pay, or short periods of imprisonment. On 8 April, seven sailors at the shore base HMNZS Tasman, in Lyttelton, refused to work and demanded to be discharged. Also that morning, the captain of the Castle-class minesweeper HMNZS Hautapu was presented a letter detailing sailor's dissatisfaction with the handling of lower-deck committees, and eleven sailors deserted. Some returned to duty voluntarily, but the rest were arrested by police. Punishment (both for those who returned voluntarily and those arrested) consisted of sentences of 60 days imprisonment, commuted to 14 to 24 days.
At the time of the initial mutiny, the cruiser HMNZS Bellona was in Australian waters, and when the ship returned to New Zealand in late April, several sailors sought discharge. On Anzac Day (25 April), about 100 of Bellona's ship's company decided not to return to duty. They recruited 40 sailors waiting to be posted to the Philomel, and on 28 April, the group presented their demands to the captain. They were informed that anyone not reporting for duty the following day would be considered Absent Without Leave. The next morning, 52 sailors were marked as having deserted, although all but 20 returned before Bellona's next deployment two months later. The Bellona mutineers received punishments of up to 92 days imprisonment, while the deserters additionally lost all unpaid pay and allowances. Arrest warrants were issued for those who did not return, with one sailor at large for over two years.
The mutinies and the resulting manpower shortage forced the RNZN to remove Black Prince from service, and set the navy's planned development and expansion back by a decade. Despite this impact, the size and scope of the events have been downplayed over time.