Please answer the following question: What type of details about walter sigel can be gathered from the following bio? Bio: walter sigel -lrb- 12 january 1906 -- 8 may 1944 -rrb- was a highly decorated oberst in the luftwaffe during world war ii , and one of only 882 recipients of the knight 's cross of the iron cross with oak leaves . the knight 's cross of the iron cross and its higher grade oak leaves was awarded to recognise extreme battlefield bravery or successful military leadership . walter sigel died on 8 may 1944 after crashing his fieseler storch into the trondheimfjord . sigel was the commanding officer of sturzkampfgeschwader 76 during the junkers ju 87 dive bombing demonstration at neuhammer , present-day Swietoszow , poland , on 15 august 1939 . observing the demonstration were the senior luftwaffe commanders , including generals hugo sperrle , bruno loerzer , and wolfram von richthofen . the lower cloud layer , which was believed to be at , was only . while sigel managed to just barely pull out in time , 13 other ju 87 crews crashed to their death . the event became known as the '' neuhammer stuka disaster '' -lrb- '' neuhammer stuka-ungluck '' -rrb- .
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