That eh is "they do it all the time, it's now a routine." and "Oh shit, did we check the fcking Daily Sortie quest #7?"
More like "Did the scouts just took out their boss!?!"
It's possible to clear 3-4 with only submarines, but that requires incredible luck as there are golden (flagship-class) CLs equipped with sonar and depth charges throughout the map.
They were sent on the usual 'send a bunch of low-upkeep ships and let them all get hit to figure out the enemy composition' scouting tactic. They were not expected to win this.
Eh?Eh?noise (sh_u_m)Eh?yuubari_melonlady[NEWS] Just letting you guys know that we've just sunk the enemy flagship of the entire Northern Sea. [Announcement]spannerAKA wrench for you Yanks.Eh?Eh?Hah?murakumolaughing_subHK@born_losersuzuyan_heeerethis_is_aobadon't_call_me_kaminari!Eh?Eh?Eh?Eh?Eh?nanodesu@baked_appleflash_of_the_dragon_soaring_in_heaven"Amakakeru Ryuu no Hirameki" is actually the name of Hiten Mitsurugi style's ultimate technique in Rurouni Kenshin.