No, no, they didn’t use bombers, they used fighters carrying bombs. Practically every WW2 fighter could carry SOME type of bomb(s)
Due to the rather lethal nature of attacking a full formation of bombers (lethal to both the bombers and the attackers, but we had more bombers than they had attackers) Germany sought many, many ways to engage fighters outside effective range of their defensive guns.
Rockets were one seemingly sure-fire method, they could carry lots of explosive, and thus didn’t need a direct hit to work. However, the Germans were about twenty years ahead of the technology with the idea – in WW2, rockets were not accurate weapons and there was no decent way to fuse them to explode when desired.
There was experimentation with very early wire-guided missiles, but that never got anywhere. Also ahead of their time.
Large-caliber cannon could work and were more accurate than rockets, but they needed a skilled pilot to hit with at long ranges, since they needed a direct hit.
Enter Wacky Idea #5923: air-to-air bombing. Since a fighter, after getting up there, knows what altitude the bombers are at, they could get bombs fused to go off at a certain time (eg- after a certain amount of drop) and get to the right altitude above the bombers, and let 'er rip.
There’s two problems with this:
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It’s horribly, woefully inaccurate. All aircraft have poor visibility beneath them, but WW2 aircraft seriously so thanks to cockpit placement. You’re basically just blindly chucking this hunk of explosive into the bomber formation and hoping it goes off in a good spot, which doesn’t make it much better than flak.
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Fighters can’t carry much in the way of bombs. One 500kg (~1000lbs) or 2-3 smaller bombs was about the best the typical German fighter aircraft could ever hope for. Couple this with the inaccuracy, and you’ve got a pretty fat chance of taking down anything. To make this effective, you’d really need bigger bombs and more of them, but for the reasons already mentioned, using your own bombers to do this was out of the question (even if Germany had that many, which for heavy bombers, they didn’t)
So, in general, it was another one of those neato German ideas born of inventiveness and desperation, that never really worked well, but makes for interesting history. I believe one of the aces came up with this one and toyed with it for a bit, but it never got widespread.
I’d love if someone had a real cite on the topic, though.