Joshua James Mackay, 25, Andrej Michael Schwaab, 27, and Levi Cheyenne Dronsfield, 27, were jointly charged with attempted murder, wounding with intent to cause grievous bodily harm, and unlawful possession of a sawn-off .22 rifle.
McKay and Schwaab will be called before Justice Gerald Nation for the start of their trial in the High Court at Christchurch this afternoon.
Last week the Crown successfully sought to have the charges against Dronsfield withdrawn.
The trial for the remaining defendants will go ahead as scheduled and is expected to last almost two weeks.