how does the coast-guard react when Beowulf and his men arrived on the danish shore?

At first the men do not know who they are and are suspicious. Once they reach the shore, they depart the ship with their armor and weapons clinking. A coast watchman stops their progress, demanding to know who these warriors are and if they are friend or foe. It isn't until introductions are made that Hrothgar welcomes Beowulf as the son of Ecgtheow, the man whom Hrothgar had helped in settling a feud with the Wylfingas long ago. Then there is much celebration.