Bismarck's heavy-gun response to Piorun and Cossack

How many of Bismarck's shells were spent against the Tribal destroyers and Piorun?

The exact total is uncertain, but Bismarck fired on Piorun for about thirty minutes and bracketed Cossack; a later estimate puts the main-battery expenditure at roughly a hundred rounds or more.

Bismarck fired at Piorun from roughly 22:38 until the Polish destroyer moved out of range around 23:08. Cossack later suffered a close spread of 15-inch and 5.9-inch shells whose splinters damaged radio equipment and a motorboat. An exact ammunition total is unavailable, but a later clarification puts the main-battery expenditure at roughly a hundred rounds or more. The sustained fire and damage from near misses show that Bismarck treated the destroyers as serious tactical threats.