dawn service at anzac cove begins as more than 10,000 australians and new zealanders gather at formal ceremony .
thousands attended the anzac commemorative site to mark the 100th anniversary of the gallipoli landings .
among those in attendance are australian prime minister tony abbott and his new zealand counterpart john key .
prince charles and prince harry also sat alongside the prime ministers at the gallipoli dawn service .
mr abbott said the troops became more than just soldiers as they were the ` founding heroes of modern australia '