A protester places an olive branch on a long baton during protests against the 1981 Springbok tour. Picture / Paul Estcourt

A protester places an olive branch on a long baton during protests against the 1981 Springbok tour. Picture / Paul Estcourt

When police in visored helmets and swinging batons, ran on to the field at Hamilton's Rugby Park, something came unstuck in New Zealand's self-image as an open, tolerant society.

Anti-apartheid protester John Minto says it felt "alien".

"It was clear we had crossed some sort of line ...

"Police were no longer a neutral party, they were determined to see the tour proceed - conflict was inevitable."

The protesters, led by Hart (Halt All Racist Tours), thought the tour would be cancelled following massive demonstrations around the country and international pressure.

But the Government refused to call it off. Some critics accused Prime Minister Rob Muldoon of making a calculated decision ahead of the general election to back the 1981 tour and curry favour in marginal rural seats, where pro-tour feeling was strongest.

The Springboks arrived on July 19, 1981, and for the next 56 dramatic days, New Zealand headlined news bulletins around the world.

In scenes reminiscent of South Africa itself, protesters clashed with police and enraged rugby fans; rugby grounds resembled war zones, barbwired and barricaded.

During the final test match at Eden Park, Auckland, a low-flying light plane disrupted the match by dropping flour-bombs on the pitch. (Pilot Marx Jones served six months' jail for the stunt.)

Public confidence in the police was battered when riot police were filmed beating unarmed "clowns" and bare-headed protesters at a sit-down.

The repercussions were even felt within Robben Island Prison, where future South African president Nelson Mandela and other prominent African National Congress (ANC) leaders were imprisoned.

Mandela was quoted as saying that "the sun shone through the dark corridors of the cells" when he heard about the protests in New Zealand.

When the tour wasn't called off after the Hamilton fiasco, Minto says the protesters realised it was going to be a "hard slog".

They had already resolved to go further than just banner-waving if necessary.

"We believed it was such a serious affront to human rights, we were prepared to take civil disobedience action to try to stop it."

Minto says that although the protesters lost the battle to halt the tour, they "won the war".