,,,,, 6nl

maybe
Berserk
Knights

[img]https://c1.staticflickr.com/1/753/22668593615_519ce54b81_o.png[/img]

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Hm, there are Crimson Cross and Ookami no Kuchi: Wolfsmund, but I haven't started reading them yet and the first one has a supernatural storyline. Anyways, at least the latter seems to be pretty realistic - and brutal... ^^"

"It's like love is a bonus in your life. Even without it, I'm just fine. I don't feel like pointlessly searching for it. You don't have to make yourself unhappy." (Ookami Shoujo to Kuro Ouji)

"Why does it rain?" - "To create drama." (Drops (Andou Yuki))

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Gunka no Baltzar is 1910s industrialized western europe. The countries are fictitious, but are very similar to Austria/Prussia/. The guns, tactics, and everyday objects are based on those in early 1900

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7-nin no Shakespeare - By the mangaka of Beck

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Maybe not so realistic and not so European but you could try Threads of Time

[img]http://www.nodiatis.com/pub/18.jpg[/img]

Innocents shounen juujigun- french chilren's crusade
Agrippa-Gauls vs Romans
Mercenary pierre-medival
Savage garden-18th century england (but its shoujo, you didn't specify a demographic so I'll just give you these too)
Bradherley no basha-Europe around 18th century again
Destiny's hand-pirates in europe...although the first two chapters are pretty good and then the rest just get worse and worse and more cliched till its end.
Vita arcana-Syria in roman times
Shoukoku no altair-ottoman empire

Ones that aren't europe nbut still have elements of ones you mentioned or generally good historical mangas:
Shut hell-Mongols (so not so much europe...and has element of supernatural)
Kingdom-chinese warring states period