https://www.cnn.com/2020/07/23/us/breonna-taylor-police-shooting-invs/index.html

Still written from the left, but you get to the meat at the 'we kept banging' header:

Taylor's apartment, according to police, was considered a less volatile, "soft target." As such, police commanders decided in advance to have officers knock and announce their presence before entry. That decision was communicated in a pre-operational briefing, according to a source familiar with the details of the operation who requested anonymity due to the ongoing investigation.

Sometime after 12:30 a.m., Sgt. Jonathan Mattingly began pounding on the door. He later told investigators he believed Taylor was alone and he wanted to give her sufficient time to answer.

Much more in article.