Celsius proved catastrophic for his untried soldiers. The success of the cable haulage was indisputable but the steam locomotive was still untried. The fuel elements in the Sodium Reactor Experiment were operating under untried conditions. The relatively untried Continentals in Gates' army were routed, and suffered heavy casualties. Therefore, he selected the untried Naval Research Laboratory's Vanguard rocket, which was a research-only booster. Gas turbines were considered but were as yet untried in such a large vessel. This is the true way, but as yet untried. The technology has been successfully pioneered in Norway but is still a relatively untried concept. Mexico's establishment of a new, untried form of government, did not bring stability. Of the division's other brigades, the 2nd and 4th Para Brigades, were untried in battle.