Britannic and Kongō provide the starting point for a survey of ships lost to submarines between 21 and 30 November in different years. Comparing the same calendar window across wartime years offers snapshots of a weapon system's effectiveness over time. The proportions and circumstances vary, so these snapshots build a picture of capability without constituting a complete account of submarine warfare. This particular ten-day window happened to include an unexpectedly large number of notable losses.
Chapter · 8:49-13:06
A ten-day snapshot of submarine lethality
Surveying submarine sinkings from the same ten November days across different years reveals recurring operational patterns.