Appendix 34: Analysis of British Night-Fighter Effort January–May 1941
Abbreviations:
S.E. = Single-engined fighters;
T.E. = Twin-engined fighters;
A.I. = resulting from airborne radar
| Sorties | Detections | Combats | |||||
| Month | S.E. | T.E. | A.I. | Visual | A.I. | Visual | |
| January | } | 402 | – | – | 34 | – | 9 |
| – | 84 | 44 | – | 2 | – | ||
| February | } | 421 | – | – | 33 | – | 9 |
| – | 147 | 25 | – | 4 | – | ||
| March | } | 735 | – | – | 34 | – | 25 |
| – | 270 | 95 | 20 | 21 | 10 | ||
| April | } | 842 | – | – | 45 | – | 39 |
| – | 342 | 117 | 10 | 50 | 5 | ||
| May | } | 1,345 | – | – | 154 | – | 116 |
| – | 643 | 204 | 13 | 74 | 6 | ||