An extract from the squadron's chronicle:

General report No. 37/43. 
Date: 27/28 April 1942.

Objective: To inflict maximal damage to the enemy's installations at Cologne and Dunkirk.
    a. primary targets: Cologne, Dunkirk.
    b. secondary targets: none
    c. date: night of 27/28 April 1942.
    d. no. of aircraft: Cologne - 4 Wellingtons, Dunkirk - 1 Wellington.
    e. route: for Cologne: base - Southwold - Knooke - Avesnen - TARGET -back.
                 for Dunkirk: base - Southwold - TARGET -back.

Results: 
    a. take-off: first a/c for Cologne - 9.55 p.m. for Dunkirk - 10.11 p.m. last a/c for Cologne - 9.59 p.m.
    b. landings: first a/c from Cologne - 1.28 a.m. last - 4.33 a.m. from Dunkirk a/c landed at 2.16 a.m.
    c. bomb load: Cologne - 4x1000 lbs GP, 20x500 lbs GP, 4 photo boombs. Dunkirk - 18x250 lbs GP, 1 photo bomb.
    d. altitude of bomb drop: Cologne: 17,000/18.000 feet, Dunkirk - 17.000 feet.

Atmospheric conditions:  near Cologne - clear, very good visibility, near Dunkirk - clear, visibility good.                      

Enemy's AA defenses: Moderate light flak and strong heavy flak cooperating with search lights. Search lights concentrated
    west of River Rein worked in cones with 20 - 30 lights each. Around 40 - 50 guns fired within each cone. Very effective
    IFF; when used, search light either came off or worked chaotically. Five or six barrage balloons observed at the altitude 
    of 6,000 - 10,000 feet. Crew of GR-A had an encounter with Ju-88, which is claimed as damaged.
    At Dunkirk, heavy activity of flak cooperating with search lights and night fighters.

Details: Cologne - Because of the encounter with enemy's Ju88 fighter, crew of GR-A jettisoned bombs at 51°00'N / 
    03°30"E. The remaining three a/c found and bombed the target. Explosions in the center of the city and near the cathedral
    observed. The crew for Dunkirk found the target and located its bombs in docks no. 6 - 8. Explosions observed.

Losses: The crew of GR-A, no. 1280: P/O Szrajer pilot, F/Sgt Niezrecki co-pilot, F/Sgt Kalkus navigator, Sgt Leniedzinski
    radio, Sgt Stasiak front gunner and Sgt Nalepa rear gunner, when flying at was attacked by a lone Ju88. During this
    encounter, due to enemy's fire, our a/c was damaged (heavy) to right elevator and its hydraulics were shot up. At the
    second fighter's pass pilot unloaded bombs and begun maneuvering , always trying to meet the enemy head on. During that
    time the rear gunner fired several times at the attacker. When coming from behind for another pass, enemy's a/c suddenly
    disengaged diving straight down. Rear gunner used 800 rounds. Ju88 is considered damaged. Our a/c returned to base and
    had to land without flaps, what caused it to overshoot the runway. Trying to avoid heating the bomb depot, pilot turned
    violently left braking left landing gear and damaging left wing. This a/c is classified as "B" category. The crew suffered not
    even a scratch. All a/c landed at base. Right after leaving the target area, GR-M successfully avoided one Ju88 and two
    Me110 fighters.

Squadron's capacity: crews operational - 11, in training - 3, incomplete - 2.
    Number of aircraft: Cat. "A" - 1, Cat. "A/C" - 0, Cat. "B" - 1, Cat. "E" - 0.

Personnel which distinguished itself during operations: Specially noticeable are action of F/O Szrajer, who distinguished
    himself in a course of last three weeks force landing twice his damaged aircraft. Thanks to his great pilot skills and
    admirable composure every time his crew survived. He gives an excellent example to whole squadron as a pilot and Pole.

                                            Signed: 301 Squadron CO
                                                        S/Ldr Krzystyniak.

Below: Wellington GR-A, no.1280 after the mission on 27/28 Apr 1942