Thereafter, judges were compelled to set bail, but they often required impracticable amounts. It is impossible (or at least impracticable) to retrofit machinery to handle larger wafers. It was initially considered to be both politically and materially impracticable. Munich was not undertaken because the extent of Canadian Corps artillery fire made it impracticable. Homma claims that gathering rubber is economically impracticable. Anything above three levels, however, proved to be physically impracticable. Galois himself noted that the computations implied by his method were impracticable. Live boating is also used where anchoring is prohibited or impracticable. The bulkiness of fit, weighted boots and lack of fins made swimming impracticable. The double majority principle was never officially recognized and was demonstrated to be impracticable. As pursuit was impracticable, the French army commenced its return march on August 10. But Italy surrendered in September 1943, and the other target ideas were dismissed as impracticable. The engine was laid aside, and the scheme for raising water was dropped as impracticable. The RAF returned his comment to Whittle, referring to the design as being "impracticable". Finding the road impracticable for transport of guns, they were re-embarked.