Light machine guns were introduced as lighter, more portable automatic weapons. They still fired the same full-power rifle caliber ammunition, but used lighter barrels without extra cooling and were fired from a bipod. Light machine guns were not intended to be fired for extended periods of time. The lightest of the new designs were not capable of sustained fire, as they did not have extra cooling features and were fed from a comparatively small magazine. Essentially a machine rifle with a bipod, weapons like the Chauchat or the Madsen 1902 were the most mobile, but were made for single and burst fire. These were used in assaults to great effect by infantry, but were less effective in vehicle-mounted and other applications.