Campaigns are remembered for battles, but they are usually decided by supply. An army eats, burns fuel, and expends ammunition at a rate that does not pause between engagements, and every mile it advances lengthens the line along which those things must travel. A force that outruns its supply becomes weaker the further it goes, while a defender falling back toward its own depots grows stronger. This is why an advance that looks unstoppable on a map can stall without a shot being fired against it, and why planners spend far more time on tonnage and road capacity than the histories usually record.
Based on the passage, an army that has advanced a great distance quickly is most likely to be
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Correct answer to question 38 (Paragraph Comprehension): more vulnerable than it appears on a map
Method
The passage says a force outrunning its supply grows weaker the further it goes and that such an advance can stall with no enemy action. Both point to a vulnerability the map does not display.
Updated: November 2026