To render a support invalid. When a unit is attacked, that support is said
to be cut. The exception is when the supporter is supporting an attack on the
would-be cutter. Thus, support is only cut by an attack "from the side".
An example. France: F(Bre)-ECH, F(MAO) SF(Bre)-ECH; ENGLAND: F(IRI)-MAO,
F(ECH) SF(IRI)-MAO. The French support from MAO is cut by the English unit
attacking from IRI. The English support from F(ECH) is cut by the French fleet
in BRE. Result: no unit moves.
If ENGLAND had ordered F(IRI) SF(ECH)-MAO, F(ECH)-MAO then the adjudication
would have been different. England now has two units attacking MAO (no unit
cuts the support from IRI) and so the French fleet is dislodged. France has
one unit attacking ECH (remember that the French fleet in MAO has been
dislodged so its support is cut) but since England had vacated ECH then the
F(BRE) moves there unopposed.
CUTTING AN ATTACK (1) [MB:Jun80]
The only way an attack may be rendered void is when the attack is via
convoy, and one of the convoying fleets is dislodged.