Harold, He Lies Below But Can Not Open Fire, Nenamgal Sipsclar (NeNaMgAl SiPSClAr). Kings Can Scan Till fiVe Cruel Men Feel Cold Nights. CouZins Gave German Assassins Several British Kremlin Robbers.

Explanation

This is an acronym -- a guide to the first 37 elements, in atomic number order. The first letter of each word gives you the first letter of what it stands for.

1. H Hydrogen
2. He Helium
3. Li Lithium
4. Be Beryllium
5. B Boron
6. C Carbon
7. N Nitrogen
8. O Oxygen
9. F Fluorine
10. Ne Neon
11. Na Sodium
12. Mg Magnesium
13. Al Aluminum
14. Si Silicon
15. P Phosphorus
16. S Sulfur
17. Cl Chlorine
18. Ar Argon
19. K Potassium
20. Ca Calcium
21. Sc Scandium
22. Ti Titanium
23. V Vanadium
24. Cr Chromium
25. Mn Manganese
26. Fe Iron
27. Co Cobalt
28. Ni Nickel
29. Cu Copper
30. Zn Zinc
31. Ga Gallium
32. Ge Germanium
33. As Arsenic
34. Se Selenium
35. Br Bromine
36. Kr Krypton
37. Rb Rubidium