Walkthu's by Justin Bracken AKA Lickshot
Complete walkthu's for all missions of H&D as well as the add-on pack Devils Bridge. These walkthru's are remarkable for their thoroughness, and are very clear and concise. Excellent for introducing newbies to combat tactics in H&D.

Walkthu's by Me, bang117
Here are my walkthru's based on strategies to conserve ammo and put team risk to an absolute minimum. They are also intended for achieving what I might consider more advanced mission goals: Not just how to survive to the end of the mission, but also how to survive with say, three team members and only sniper rifles and Colt pistols—in generally any situation. These I find to be tantalizing sorts of objectives on missions I already know to a ferywel

Walkthru's with Garanteed Success for Missions that seem Impossible
Here I have found and/or collected walkthru's for such missions as C3M6—that often just seem impossible for some reason! These are intended to be as simple as possible, and intended only of the purpose of completing the mission—and without cheating that is! It is funny, but sometimes following the line of logic is not as surefire a solution. :-)

Walkthru's by Misc. H&D Players
Any player who has an interesting method for doing a mission in walkthru form, I would be happy to post it here.

Misc. Walkthru Listings
Many sites have walkthru's, here I have links to as many site's walkthru sections as I know of, and are listed in alphabetical order.