 Complete the following phrase:  National and military authorities were reluctant to adopt the weapon, and Maxims company initially had some trouble convincing European governments of the weapons efficiency. Soldiers generally held a great mistrust of machine guns due to their tendency to jam. In the 1906 version of his book Small Wars, Charles Callwell says of machine guns: The older forms are not suitable as a rule... they jammed at Ulundi, they jammed at 