Tactic and counter

Pairs of battles: the first shows a tactic working, the second shows the weakness that defeats it. The website shows these as a "Tactic and counter" section, linking both records.

Pair	Tactic	Shown working	Counter / weakness	Shown failing	Status
P1	Breakthrough at the centre	B013 Gaugamela (331 BCE): Alexander stretches the Persian line, strikes through the gap at Darius	The yielding centre and double envelopment: let the attacker push in, then close on both flanks and the rear	B017 Cannae (216 BCE): the Romans' deep push is swallowed by Hannibal's crescent	both drafted

Candidate pairs (to propose to Brian)

Oblique order: B012 Leuctra (works) / later counter to be chosen.
Scythed chariots and elephants: B013 Gaugamela and B018 Zama (lanes opened, both neutralised).
Heavy-cavalry shock: B047 Agincourt and B043 Crécy (defeated by archers and ground).