The 4th Destroyer Flotilla arrived in Scapa on 1st March. The personal diary of Lt A P Bush of HMS Spitfire for the period 28 Feb to 29 December 1915 makes mention of Acasta. Most entries relate to social activities but some show the sort of work that HMS Acasta was involved with – principally patrolling and escorting.
1st March
It appears that there will be a lot of patrolling.
2nd March
At night the Acasta joined up with us, and patrolled all night in the w. end of Pentlands.
17th March
… went out at 7.00 am to relieve Acasta early... Hoxa Sound patrol.
18th March
Went on to Kirkwall patrol at noon and relieved Acasta. Our job escorting merchant ships in & out of Kirkwall.
31st May
Acasta went down for docking, our turn ought to come soon.
4th June
We went out with the 1st Div (Acasta away), Defence, Warrior and D of E and these covered boarding steamers.
29th September
We were to have gone to sea at 11.00 am with Shark and Acasta on some secret mission*, but as it was blowing so hard again – only they went and Sparrowhawk and ourselves banked fires at 4 hours notice.
1st October
We got orders to go out at 10.0 am. We are going down the west coast to meet the Acasta and Shark who are escorting the Barham (just completed) up.
2nd October
We met the Barham at 5.30 am.
10th October
Had to get the Acasta's kite from her at 10.0 pm.
9th November
Acasta, Ardent, Fortune & Hardy are back from dock.
* The secret mission was to travel to Clydebank to escort H.M.S. Barham, who had just completed trials, to Scapa.