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Skirmish on Casbin Part of the Armstrong cluster campaign of the Eden Prime War
The geth outpost on Casbin shortly before its destruction
Date:	29 June 2183 CE
Location:	Casbin / Hong / Armstrong / Milky Way Galaxy
Outcome:	Alliance victory Geth heretic facility on Casbin destroyed Saren's Alliance forces expelled from Hong system Commencement of Operation: Arrowhead
Belligerents Systems Alliance Saren's Alliance Geth Heretics Commanders Marcus L. Shepard Unit Y5552 Strength Normandy Squad 7 combatants 1 M35 Mako Systems Alliance Navy 1 Normandy-class stealth frigate SSV Normandy Geth Heretic Army 1,136 geth troopers 4 geth armatures 1 geth colossus 212 geth destroyers 52 geth hoppers 13 geth recon drones 36 geth assault drones 80 geth juggernauts 2 geth primes Geth Heretic Navy Heretic Reserve Fleet 1 geth heavy frigate 3 geth dropships Casualties None 2 geth dropships shot down Geth outpost razed All geth ground forces eliminated

The Skirmish on Casbin was an attack by the squad of the SSV Normandy on a geth heretic base located on Casbin that occurred during Operation: Arrowhead. Due to the growing threat of Saren's Alliance, and the ever increasing incursion of geth heretic forces present in the Armstrong cluster which was likely a precursor to invasion, the Skirmish on Casbin was the first of five engagements to expel Saren's troops from the cluster. The first of these engagements and, like the attack on Maji, one of the smallest, Marcus L. Shepard and his men managed to neutralize the geth on Casbin before their base could be established.