From Rising Sun And Tumbling Bear, by R. M. Connaughton (Orion, 2020), Kindle pp. 49, 51:
Ships had barely reached full complement when the Japanese were seen again. At 8 a.m. a reconnaissance party of four light cruisers, the Third Division commanded by Rear Admiral Dewa, steamed some seven miles off the port without coming into range. Dewa saw the Russian fleet gathered under the protection of the forts. They had moved their positions but by only a few miles to the east. Dewa picked out the two battleships and cruiser aground. He sensed the Russians were in a state of shock and from his cruiser the Takasago recommended that the First and Second Divisions be brought up to consolidate the night’s work. Togo was concerned about the firepower of the forts, but hearing that the enemy appeared unprepared and disorganised he decided to take the risk. Just before midday the Russians saw the Japanese fleet. The lookouts in the forts sounded the alarm as they witnessed the Japanese bearing down on their own Boyarin making full speed towards the harbour and firing her stern guns to no effect. Chaos reigned in Port Arthur. Lighters had moved alongside the Retvizan and Tsarevitch to keep them afloat. Warships moved quickly to jettison inflammable material while enterprising coolies in sampans sifted through the jetsam for the more attractive souvenirs. Captains leapt about demanding to know why their ships were not ready, while all the time they could see the dark smudge on the horizon being blown towards them by the southerly wind in the clear blue sky. As the smudge grew larger, so did the frenzy of activity on the Russian warships. At 12.15 the flagship Mikasa, leading the First Division, opened fire with her 12-inch guns. Only the large calibre guns were used as the three divisions steamed in succession from west to east.
The Tsar was stunned by the news of the attack. He could not believe that Japan could initiate a warlike act without a formal declaration of war. Both he and the Emperor of Japan declared war on 10 February 1904. The rest of the world was by no means anti-Japan. The Japanese were masters of the psychological approach and secrecy. The Times summed up Britain’s attitude to her ally by dismissing the pre-emptive attack as being quite normal for wars in modern times. The Americans were not so quick to embrace the Japanese sense of realism, yet they reluctantly fell in line behind a sympathetic President Roosevelt who had become the centre for Japanese fawning and attention. The next few days were set aside for reflection and assessment. Togo was disappointed by the apparent lack of success of his torpedo attack. His real success, however, needs to be viewed in terms wider than that of pure shipping. In this action at Port Arthur, he had settled an old score and laid claim to his fleet’s recognition as being on a par with the best in Europe. He had won command of the sea and at the same time almost completely demoralised his enemy.