Just an echo of what everyone else has said.
Neutralise their transports, whirlwinds can be your friend against hidden trnasports. Don't forget open topped are vulnerable to blasts. As a guard player my mortar squads have had great success dropping trnasports and pinning elements of DE armies.
Pinning elements of a DE army can be a quite effective tactic allowing you to limit your opponents options in their turn, so thats whirlwinds and maybe some sniper scouts.
They will outmaneuver you, so accept that. They have a lot of low AP weaponry so use cover, can also help when you get assaulted.
For me it is similar to fighting 'nids target priority is key. Pick your number 1 priority and make sure it drops or stops before you move onto secondary targets.
Neutralise their transports, whirlwinds can be your friend against hidden trnasports. Don't forget open topped are vulnerable to blasts. As a guard player my mortar squads have had great success dropping trnasports and pinning elements of DE armies.
Pinning elements of a DE army can be a quite effective tactic allowing you to limit your opponents options in their turn, so thats whirlwinds and maybe some sniper scouts.
They will outmaneuver you, so accept that. They have a lot of low AP weaponry so use cover, can also help when you get assaulted.
For me it is similar to fighting 'nids target priority is key. Pick your number 1 priority and make sure it drops or stops before you move onto secondary targets.