Feb 5/6 approx midnight : Japanese navy attack on Port Arthur, destroying 4 battleships.
Japanese gained control of sea with mines and torpedoes.
Siege of Port Arthur: 150,000 Japanese vs. 103,000 Russian soldiers and 30,000 railway guards.
Outcome:
Port Arthur surrendered in Jan 1905 having lost 28,200 troops
Loss of sea allowed Japanese to land troops, cutting off Russian forces.
Humiliating defeat of Baltic Fleet at Tsushima Straits in May 1905 the baltic fleet led by 8 battleships Destroyed within 45 mins at Tsushima by Japanese Navy. (major powers reconsidered russia naval stratergies)