Hello Flash Company. All of those domestic animals with hard feet are a problem here actually. Old land. Worn down. Used to soft-footed creatures.

Howard for what it's worth I have -
"A 'Black-Ball' ship come down the river," as that line in "Congo River". As in a ship of the "Black-Ball" line.

Don't know the source off-hand. Must go listen to the Clancy Brothers version again.
Cheers, Joy