Joffre planned once again for attacks by the BEF and French Tenth Army, combined with another French offensive in Champagne. Cavalry, and infantry in buses, were to be ready to exploit as far as Mons and Namur. He wrote to GHQ (12 June) that the ground at Loos (where a British attack could unite with a French attack on Vimy Ridge) was "particularly favourable", although Haig reported (23 June) that the planned ground at Loos was unsuitable for an attack. French visited London (23 June) to talk to Kitchener, with Robertson, whose relations with French were breaking down, remaining behind. At a conference at Chantilly (24 June) French and Joffre agreed that further attacks on the Western Front were needed (to do otherwise was "unfair to Russia, Serbia and Italy") and that they should ask their governments to send all available troops to France rather than other fronts.