Since Hawkeye has requested me to answer I'll write one down.
In the Corvan 2 defense sequence of the episode "The But her Knife Cares not for the Lamb's Cry" it's clear that the USS Discovery leaves a cluster of devices behind when it jumps out on its spore drive to destroy the Klingon Birds of Prey.
In the sequence USS Discovery jumps in and destroys the first two birds of prey using its phasers.
Captain Lorca orders a full stop and the ship sits still in the atmosphere over the colony absorbing Klingon fire depleting its shields.
Captain Lorca waits until the Birds of Prey are close enough for his plan to work, when he judges that they are close enough he makes the statement " Let's leave our Klingon friends a message they won't forget" and give the order " And Go".
The Discovery then enters a spore jump and once it has jumped we see briefly for 1-2 seconds 5 metallic looking devices left behind which explode destroying the Klingon ships.
Images from Star Trek Discovery (S01E04) - The Butchers Knife Cares Not for the Lambs Cry
40:21 - Discovery 'spores' out of there.
40:23 - Bombs left behind.
40:24 - Bombs explode.
40:25 - Wider shot of explosion a second later showing Klingon Warbird being engulfed.