[Strategia_In_Ultima]

If you are being attacked by a (far) larger empire, dig in. Mine all your WPs leading to his space to the max, place as many defense sats as allowed, and deploy fortress bases and defense fleets just in case he breaks through the mines and survives the sats. Station mothballed fleets at your planets/SY bases just in case he manages to survive the mines, sats and ships/bases with any semblance of strength left. If you can't support defenses that size, collapse all WPs leading to his territory and build System Grav shields. DO NOT ISOLATE YOURSELF!!! You only need to close the WPs to his space! He probably will open up another WP on you somewhere, but at least you'll buy yourself some time.

Otherwise, build up vast assault fleets somewhere secure (like a dead-end nebula system) and open a WP directly to the enemy's home system. Wham bang and you've dealt a good blow to his economy. Perhaps even crippled him, if he hasn't built up a decent economic base in other systems.

edit: corrected /bold tag