"They assumed Britain would obey arithmetic rather than rebuild it."
It is sometimes said of war that " amateurs study tactics, professionals study logistics ." This video shows how the British managed to supply a Task force including ships, planes and men at a distance of 8,000 miles, which the Argentine Junta had not believed to be possible. The Argentines were not wrong about the arithmetic of supply making it very difficult for Britain to sustain a fleet in the South Atlantic. The British knew that too. So they changed the arithmetic.