By the end of July, there was no expectation of a rapid German collapse, as the defenders north of the Somme had been relieved by three times as many fresh divisions and the Fourth Army was ordered to prepare for a German counter-attack. Intelligence reports showed very high German casualties and that one of the fresh German divisions had previously lost of its infantry strength at Verdun. A copy of the order given by Below for unyielding defence was captured in late July, which indicated that German tactics were making attrition a feasible Entente objective. The destruction of British intelligence networks in northern France and Belgium restricted GHQ Intelligence to gleaning documents from the battlefield and prisoner interrogation, causing an underestimation of the number of German divisions available for the Somme front. On 2 August, Haig issued a directive stating that Falkenhayn could continue to replace troops on the Somme and a German collapse was not expected, forecasting a "wearing-out" battle until September. Anglo-French intelligence estimates of German casualties ranged from in July.