Attrition out of National Ante-post punters suffered a blow on Monday as the well-fancied War Of Attrition was ruled out of Saturday's John Smith's Grand National at Aintree. The 10-year-old was as low as 12-1 with Ladbrokes and had been the subject of a gamble for the four-and-a-half-mile marathon. However, trainer Mouse Morris has decided not to run as he is not totally satisfied with the gelding and he will now rely on Hear The Echo. He told the Racing Post: "We weren't 100 per cent happy with War Of Attrition this morning and we've decided against sending him to Aintree. "Hear The Echo is 110 per cent and he will be our runner in the National." War Of Attrition was set to shoulder 11st 9lb in the National with the Donald McCain-trained Cloudy Lane due to carry top weight of 11st 10lb.