More than 1500 people, mostly Australians, attended Saturday's service in Pozieres village where Australian units attacked and took German positions on July 23, 1916, but paid heavily in blood over the coming weeks as intense German shelling and counter-attacks took their toll.
Australian casualties at Pozieres and nearby Mouquet Farm totalled some 23,000, including more than 6700 men who died.
During Saturday's service at the 1st Australian Division Memorial, Veterans' Affairs Minister Dan Tehan said more Australians were lost in eight weeks of fighting in the Pozieres battle than during the eight months of the Gallipoli campaign.
Highest French honours for Australian couple
France has bestowed it highest honour on an Australian couple for their support of a small village where thousands of diggers died in World War I.
He said the German bombardments suffered by the Australians were "some of the most severe of the entire First World War".
The minister quoted one soldier who wrote home saying, "the Gallipoli veterans here say the peninsula was a 'happy picnic' to this push ... courage does not count here, it is all nerve."
"The poor, wounded devils you meet on the stretchers are laughing with glee, one cannot blame them, they are getting out of this."
Australia's ambassador to France Stephen Brady said the battle reduced farmland to a moonscape of craters while homes were reduced to rubble.
He quoted Captain Aubrey Wiltshire who noted in his diary that "stinking corpses lie everywhere, there's a man with his face blown off ... here, a good Australian lad with his leg lying beside him."
