I found this elsewhere on the intermernet.
"There were not enough guns and there was nothing like enough ammunition...
On 6th, 7th and 8th May, Sir Ian Hamilton had attacked with 20,000 men on a three mile front. 18,500 rounds were fired from all guns, British and French and the ships, much of it was shrapnel which had little destructive impact on defences. Thus for 6,000 rounds per day he advanced 600 yards at the cost of 6,500 casualties. He never closed with the enemy's main positions which were not yet completely wired; he was held up by isolated, unlocated but well coordinated machine guns concealed in natural cover. On the following day, at Aubers Ridge in France, Sir Douglas Haig attacked with 30,000 men (with 25,000 more in reserve) on a two mile front. 500 guns fired 80,000 rounds to support him in one day. This too failed, but had half that force been available to Sir Ian Hamilton they might well have enabled him to drive the Turks from the peninsula ...”