Whenever Harbour got within rumbling distance its big forward pack went to work.
Hale T-Pole, Charles Elton and Ben Whale combined to dominate the lineout, and openside flanker James Tomkinson had a busy game.
But while Alhambra-Union struggled to match the Hawks’ physicality, it showed some character, scoring two late tries to nab a four-try bonus point in what was otherwise a comprehensive win to Harbour at Watson Park.
Hawks centre Aleki Morris opened the scoring when halfback Tala Fagasoaia caught the defence napping with a quick tap.
He passed to Morris who partly slipped a tackle and reached out to score.
The second try was classic Harbour.
Prop Peter Mirrielees crashed over after the Hawks’ pack got a lineout drive going and bulldozed its way towards the line.
Alhambra was guilty of not treasuring possession and too often had the ball knocked clear by some big tackles in the midfield.
It went to the break trailing 24-0 which was soon 31-0, after the team failed to number up on defence.
Harbour coughed up the ball from the restart and Alhambra-Union got on the board through an Adam Simpson try.
It was the first of four second-half tries for the visitors.
It owed its second to a wonderful clear out by loose forward Ben Tuiomanufili.
He blew several Harbour players off the ball and Legin Felix-Hotham scooped it up and ran 80m untouched to score.