After construction each country may strategically redeploy a certain number of units. SR is not permitted adjacent to enemy units, so a 3-hex corridor is needed. SR from Britain into the Mediterranean requires either two fleets (via Gibraltar - one of the fleets must be based there) or else 2 SRs and a one-turn delay (via the Cape of Good Hope). The USA also has an Initial Deployment Limit, which restricts how many units may be moved by SR each turn from the USA (shown as a box in the top-left of the map) to its main base in Europe (normally Britain). Germany's SR limit (9), although large, is not enough to cope with war on three fronts from 1944 - rebuilt Hungarian units can take a year to walk back to the Eastern Front - and can be a key factor in her collapse in the late game.