Mowbray's dire campaign has gone from bad to worse when the side was forced to forfeit its Cricket North clash.
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The club had made the call on Friday, a day before it was due to face reigning premier South Launceston.
The Knights secured their first official competition win without a ball being bowled amid an interrupted season that began with a washout.
Eagles captain-coach and taliswoman Dana Lester had been ruled out weeks earlier over a representative netball coaching commitment.
Mowbray have yet to win a game in both the Cricket North and Greater Northern Cup female competitions.
It has been a tough seven days for the inexperienced lineup that relies on Lester.
The women were bundled out for just a paltry 17 against Sheffield last week to set a 38-ball run chase and were later dismissed for 51 in pursuit of Latrobe's 119.
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Launceston has shot to the top of the Cricket North table on Saturday, remaining unbeaten after three rounds.
The Lions had little trouble disposing of Riverside, who caused an upset win last start over South Launceston.
Stacey Norton-Smith hit a commanding 79 not out off 67 deliveries that included eight fours and a six, piloting Launceston towards a huge 3-131 in the Twenty20 clash.
It was the second highest score of the female summer after veteran captain Belinda Wegman belted an unbeaten 88 off 55 for South Launceston that forced Devonport to better the 3-153 total.
Riverside had looked to be off to a solid start, moving to 1-29 in the seventh over.
Charlotte Layton was soon introduced into the attack and changed things dramatically, removing three of the top-five batters before the rest of the order floundered.
Sara Wilkin was the only Blues batter that took it up to the Lions with a top-score 16.
Layton finished the match with 3-12 in 18 balls.
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