Short answers, pulled from the story.
The East Pomeranian offensive was a Soviet Red Army strategic operation against the German Wehrmacht on the Eastern Front, conducted in Pomerania and West Prussia from the 10th of February to the 4th of April 1945. It consisted of four phases: the Konitz-Koslin, Danzig, Arnswalde-Kolberg, and Altdamm offensive operations.
Large German formations remained intact in Pomerania after Rokossovsky's 2nd Belorussian Front was redirected northward during the East Prussian offensive, leaving them on the exposed right flank of Zhukov's advance. The Germans launched a surprise counter-attack, Operation Solstice, in mid-February, confirming the threat. Soviet planners concluded Pomerania had to be cleared before the Berlin offensive could safely proceed.
Marshal Konstantin Rokossovsky commanded the 2nd Belorussian Front, which carried out the main effort. Marshal Georgy Zhukov's 1st Belorussian Front contributed its right wing, including the 3rd Shock Army and the 1st and 2nd Guards Tank Armies, joining the attack on the 1st of March 1945.
Danzig fell on the 30th of March 1945. According to Soviet claims, the Battle of Danzig cost the Germans 39,000 soldiers killed and 10,000 captured. Evacuation of civilians and military personnel from the Vistula delta and the Hel Peninsula continued until the 10th of May 1945.
Colonel-General Walter Weiß commanded the German 2nd Army but was relieved on the 9th of March 1945, one day before Elbing fell. He was replaced by Dietrich von Saucken, who was then ordered to hold the Danzig-Gotenhafen Fortified Area as long as possible to keep evacuation routes open.
Soviet forces surrounded the coastal town of Kolberg by the 4th of March 1945, where many civilian refugees from Pomerania had gathered. The town held out until the 18th of March, by which time the evacuation of its population was nearly complete.