Veterans' Affairs minister Craig Foss says preparations for the Battle of Chunuk Bair centenary service at Gallipoli are going well.

He says Chunuk Bair was the site of the New Zealand Expeditionary Force's most significant action during the Gallipoli campaign.

Hundreds of Kiwi soldiers fought and died in an ultimately futile bid for control of the strategic vantage point.

The centenary service on August 8 will honour those soldiers for their bravery and sacrifice.

Mr Foss says the Chunuk Bair service is free and anyone can attend.

People need to register on the Gallipoli 2015 website to assist with planning.