"The new risks to such a force under modern military conditions have also to be weighed. The risks that were incurred in 1914, in landing a field force of 100,000 men in a foreign land, were much less than would be run to-day—when it may have greater distances to cover, and when both railways and roads will lie under the menace of air attack. Broken communications are bad enough when an army is in its own territory, or one where it has complete control. In face of air attack it is impossible to ignore the risk of a field force being stranded with no prospect either of reaching the front or of maintaining itself. In such a plight it could do little for the defence of British interests and it would be more nuisance than a help to any ally... Before the idea of intervention by land is accepted as politically indispensable, there should be full acknowledgement of its unstable military foundations. It should also be made clear to any nation looking to British aid, whether under the old Locarno Treaty or under its possible successor, first, that they may get more value from increased air assistance, which would naturally become effective sooner, in place of a field force; secondly, that the dispatch of a field force cannot imply a willingness to reinforce it without limit, and to expend the massed man-power of this nation, fully engaged as it must be by sea and and in the air, and in factory and farm, in another four years' process of exploring by trial and error a problem which can be, and could have been, examined scientifically."