Question

Why did the old man shake his head? Who found the skull?​

Answer 1

The old man shakes his head by looking at the skull and the skull was of poor fellow who lost his life in the war. Peterkin found the skull.

KILLER ✌

Answer 2

$\huge\star\underline{\mathcal\color{brown}{HELLO\:MATE}}\star$

$\color{brown}{HERE\:IS\:YR\:ANS}$

✶⊶⊷⊶⊷⊷⊶⊷ ❍⊷⊶⊷⊶⊷⊶⊷✶

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☆The old man shook his head and had a natural sigh to assure the children that he knew about the skull.

Moreover

He wants to show his grief towards the poor and innocent person who died in the war whose skull was in his hand at that time

$\fbox\color{brown}{HOPE\:IT\:HELPS}$

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$\huge{\mathcal{THANKS}}$

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$<marquee >☝️ABHI☝️$