Scild-truma

According to the Old English Dictionary:

an;

scild-truma

m. A phalanx; testudo :-- Under þiccum scyld-truman subter densa testudine, Ælfc. Gr. 47; Som. 48, 29. Of sceltruman testudine, Hpt. Gl. 475, 66. [He makede his sceldtrume swulc hit weoren an hær wude. Laym. 16371. A scheltrone hec acies, Wrt. Voc. i. 240, 9.] scild-truma