Military historian Steven Zaloga claims that the devices "were not as widely used as the legend would suggest", nor were they as effective as is often believed. But Max Hastings and Chester Wilmot credit the invention with restoring battlefield maneuverability to the Allied force. Martin Blumenson states that while the device restored mobility in hedgerow country, it "was of little tactical value in the breakout, except possibly as a morale factor to the troops, since the tanks advanced on the roads, not cross-country."