In 1981, TSR published the module G1-2-3: Against the Giants. It was written by Gary Gygax and illustrated by David C. Sutherland III, David A. Trampier, Jeff Dee, David S. La Force, Erol Otis, and Bill Willingham. It consisted of a 32 page booklet and two cover folders containing maps. The material was previously published in 1978 as three separate adventures; G1 Steading of the Hill Giant Chief, G2 The Glacial Rift of the Frost Giant Jarl, and G3 Hall of the Fire Giant King.
This conversion guide allows DMs to run the original module with 5th Edition rules and provides a reference sheet for encounters. It is intended for at least 6 characters of levels 10-12.
To use this conversion guide you will need a copy of "G1-2-3 Against the Giants".