Counterattack " Counterattack " is the nineteenth episode of the ' . It first aired on March 4 , 2011 . Official description . " " With freed prisoners in their possession and the brutal warden attempting desperately to thwart them , Obi - Wan and Anakin search for a way out of the Citadel and back to Coruscant . The prison , however , has more traps , perils and pitfalls in store for them than they had imagined and they must work past their differences if they are to escape . Their bid to board their shuttle fails when heavy weapons fire destroys the escape craft . ARC trooper Echo dies in the blast . The escapees then flee to the caves and call for rescue from the Jedi Temple on Coruscant . " " Plot summary . As Anakin Skywalker and his team edge along a magma - filled chasm in the caverns underneath the Citadel , he contacts R2 - D2 to prepare their ship for departure . Kenobi , whose team is sneaking through the Citadel ' s ventilation shafts , is about to rendezvous with the shuttle on a landing platform , but they blunder into a probe droid . Although they manage to destroy it , security hatches begin shutting off the vents , killing yet another clone trooper and slowing the group ' s progress . Meanwhile , warden Osi Sobeck is contacted by Count Dooku , who presses him to gain the full information about the Nexus Route . At the same time , Ahsoka Tano , who is leading the team while Skywalker covers their retreat , becomes the object of open criticism by Tarkin , with whose general viewing points about the Jedi ' s role in the war Skywalker begins to sympathize . They meet a wall which bars their progress , and commando droids armed with force shields , but Tano manages to slip them two thermal detonators , taking them out and allowing them access to a fuel pipeline which will bring them to their rendezvous point . R2 encounters a hazard of his own as they find the landing platform where they should meet Kenobi ' s team guarded , but the little droid manages to fool the attending tactical droid K2 - B4 that he is actually a prisoner of his droid squad and thus gets inside the fortress . When Obi - Wan notices the shuttle seemingly abandoned , he smells a trap and attempts to approach it via a detour route , but finds that Sobeck has anticipated this tactic and prepared a welcoming party consisting of a squad of heavily armed battle droids . They are brought before Sobeck as prisoners . In an attempt to get the information , Sobeck executes one of the clone troopers before ordering the security droids to have them interrogated . R2 learns of this , however , and his battle droid team diverts the prisoners to freedom . Skywalker ' s team likewise runs into a droid force at their exit point , but Skywalker manages to annihilate them by blowing up the pipeline . These escapes plunge Sobeck into difficulties for providing an explanation to Dooku , and in desperation he sends out his remaining forces to the landing platform , where Skywalker just rejoins Kenobi . During the fight , a commando droid commandeers one of the platform cannons and prepares to fire at the shuttle . Echo attempts to intercept him , but the droid succeeds , destroying the shuttle and critically injuring Echo With their immediate means of escape gone , Kenobi contacts the Jedi Temple , requesting a rescue operation . While the fleet is on its way , the fugitives have no choice but to hole down within the cave system until help arrives , and with Fives throwing a last thoughtful look back to his friend Echo ' s charred helmet , the group departs to find a hiding place . Behind the scenes . During Kenobi ' s team ' s capture outside the Citadel , it is noted that the clones were bearing E - 5 blaster rifle s , the ones that the B1 battle droids use , instead of their usual DC - 15 blaster rifle s . But later on during the fight on the landing pad outside , the clones were once again seen using their standard blaster rifles . In the previous episode , aside from Commander Cody , Captain Rex , Echo and Fives , there were only four other clones accompanying the rescue team . One was killed by an electromine while another was shocked to death by an electrified wall , leaving only two clones left . However , in this episode , even though the remaining two clones were also killed by a security door and Osi Sobeck respectively , another clone was seen accompanying the team showing that five clones had accompanied the team despite the fact that only four were seen with the team in the previous episode . The moral cited at beginning is a variation of the famous " Murphy ' s Law , " which typically states : " Anything that can go wrong , will go wrong . "