Haushofer also denied assisting Hitler in writing Mein Kampf, saying that he only knew of it once it was in print, and never read it.[42] Walsh found that even if Haushofer did not directly assist Hitler, discernible new elements appeared in Mein Kampf, as compared to previous speeches made by Hitler. Geopolitical ideas of lebensraum, space for depth of defense, appeals for natural frontiers, balancing land and seapower, and geographic analysis of military strategy entered Hitler's thought between his imprisonment and publishing of Mein Kampf.[2] Chapter XIV, on German policy in Eastern Europe, in particular displays the influence of the materials Haushofer brought Hitler and Hess while they were imprisoned.[43]